CINXE.COM

<!DOCTYPE html><html lang="en-US"><head><title>Just a moment...</title><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><meta http-equiv="X-UA-Compatible" content="IE=Edge"><meta name="robots" content="noindex,nofollow"><meta name="viewport" content="width=device-width,initial-scale=1"><style>*{box-sizing:border-box;margin:0;padding:0}html{line-height:1.15;-webkit-text-size-adjust:100%;color:#313131;font-family:system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,Arial,Noto Sans,sans-serif,Apple Color Emoji,Segoe UI Emoji,Segoe UI Symbol,Noto Color Emoji}body{display:flex;flex-direction:column;height:100vh;min-height:100vh}.main-content{margin:8rem auto;max-width:60rem;padding-left:1.5rem}@media (width <= 720px){.main-content{margin-top:4rem}}.h2{font-size:1.5rem;font-weight:500;line-height:2.25rem}@media (width <= 720px){.h2{font-size:1.25rem;line-height:1.5rem}}#challenge-error-text{background-image:url(data:image/svg+xml;base64,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);background-repeat:no-repeat;background-size:contain;padding-left:34px}@media (prefers-color-scheme:dark){body{background-color:#222;color:#d9d9d9}}</style><meta http-equiv="refresh" content="390"></head><body class="no-js"><div class="main-wrapper" role="main"><div class="main-content"><noscript><div class="h2"><span id="challenge-error-text">Enable JavaScript and cookies to continue</span></div></noscript></div></div><script>(function(){window._cf_chl_opt={cvId: '3',cZone: "oeis.org",cType: 'managed',cRay: '92d3eb0d0b0aab53',cH: 'ril7mXTJVRQVNbySjE7M_q7jg.OxSfplDV5.kMhSFMQ-1744137888-1.2.1.1-jfILPQnusIjVklx3x9u3sIcfhBpkEDZKG593vntFUA2UyE6AItOmHNKbL6DbcH3C',cUPMDTk: "\/?language=hindi&__cf_chl_tk=9kSHS8fBxfknx9EyMNboQqTfhbUHzF_hsh2sgVo_qbQ-1744137888-1.0.1.1-cFp8Tmv1sEBrLlLzkvzPmJV90DJl6X0Fho6ClxX4WBI",cFPWv: 'g',cITimeS: '1744137888',cTTimeMs: '1000',cMTimeMs: '390000',cTplC: 0,cTplV: 5,cTplB: 'cf',cK: "unsupported_browser_beacon",fa: "\/?language=hindi&__cf_chl_f_tk=9kSHS8fBxfknx9EyMNboQqTfhbUHzF_hsh2sgVo_qbQ-1744137888-1.0.1.1-cFp8Tmv1sEBrLlLzkvzPmJV90DJl6X0Fho6ClxX4WBI",md: "RcsbFSD8iJNk6Qc1ana_CHlzsuDpDzcLwuPRESxfqaI-1744137888-1.2.1.1-2wkBk.YNZnb8Zl97W5MG6j0W4zonNDVsxcT8SWObid5UzlX1GhWAQijRdqgWywoSvqkRHu1n9xgYBb.6m41ow8.V.1tot4__tXF2rBMAJmOJGsiv.1KTQ0GnGYfBt4hX4..IW1ZbTkk9SkFyrPvEAP94qHRmIBLkgRhrB9MP2RFnAzBwIDQrAL7R_9By6YW4sEKSzouxo86kE_I25x7SrQKmICtH.KBTGEpxZzVRGgUfZB65gAqyWTVGcjgwjmBFh3Dtp9DPlxZcA5YkOhg67lS8zA1UW7F2FlS842.SwelLEGELI6AUauTKn_jxZt1.eErZ7JlXiIUKrDb.6kTDNgKURtF_V44N0900BxaH6ruAWESe9h9sA_QMnZrP1vRajfXmCujAKw2h5E9m.NwOWdG1YEnu.izMor3ilRuKcGtaFT7KNOoW1QVLo0OeyvsWzvBVbdAxCdRMxVI9jTbt0V6kEFKaKvC3JVEPVpRpewez.VLct0rBqLSuU_gOcu64G8MQacbeYC7M7XjKeWjMzD1Dl0iXALnI8ynmXdTx5V7Y2Rwp7cq_mVw9Of_Q70jFLtQxi5LS4kuOaZqre_D0vdZNOyKhTa..t4Oqch6_k.6x3Q4HVEWeKVGM5xQzq0UiClLSvHUhpxfs.p_2f2NvEmAsbE_XXDNaByuSW5OTD16JoW1jIEeqeOTAh3uKSmwsOophRiPKQRv8RXssk3M2titYHMRwXKZKWXvkgXTyBNxeH4BDQxu6IqxN_.svSQDkzpJkwjQpNyXuYo5ZfgBra8XDGIMHzILYsav4TvHvOutC__r5SM16oBRVPMI78RMyjy_xkyUH.c0avi2JrsIwY2RTOgckqNcQumPW.V5HDb2tG.VVfReif4OiipH3XJ_oPORcvtIDr0pjXYXuKON1jf1pKQiPZNK9ZnHEfIITj_atanYTpOdz1E3QPtLjTnjLeaUuHp4nSb.htbOLrf8YCaoOcz9bJX4kK4F0cr9vpcsktv4DRz1gpRHKjFXE204s4UAETPq_3s7w7oKxEhfnLrHdIgFPWpCl_H9MlRdJ9.Q2LcJ7_1oK__CVUL1PncX9v1zzSzEzUJiFXGtVfJEseg",mdrd: "CxdkGincKDMuILHLZ.5m_.cjqHFNbxmMhm965jrCEYc-1744137888-1.2.1.1-8kFxqpT9HCEEccoMv0sWpjpecge3gLDXg6LNAv6lY.Y7oHcV1wR8pPamVmgblbrf4csqlEyqv5yYB6DpYbNCDL1zbUyZk.dgymD6xGJ4IZDr2dpDOPkyn8qqBEBT6JWPPT4Wpj44DQ2S51DjSpFG9O3moVYXYf5tXRqH2k_MGGIw7runV_nVySam5kjL9BzBHjwjk7eSMkLbFdN2ovZzbZ1IjjMQFRPopSxEOQyw.33KtuLhhXod_TTGC7pqUPDq..7Q4JIofjgDaj8IJcyICJBQlXK6G8oyhtfdCbIqK.JfHRwPggBWUjf7bbCfxtoSnXlof01anDIDcOisx8AgkZ2S84IaVVdelNpZJe0q8u4HHJFpCycTvPLB_thE3QSr.vAylrqFAZqXg418bnYe0eiV.hNYyFFrSIApg8O.aELlH1AR023A1bYqn0dNVcy3dIdKxV2uPcH2fl686YCnAiI3xSSrmDhriEfwwRsnsLzmtRHn.FcTyuZHB8ZSKJ_2vHnmtWTnoz1HCgz0Mwz0kqg3Z65NZ.LJ8pj8HZeZyjQknOLcLW.5PoAxN2blgP5dkpATLo.w7yafw5skyQEUMlIuAYGTwDF33lTYMC9wGQKRYNLe3CgJGmi68Bl0zh6YWkzzcUkJfYJSXDj9uwPkpkiIY1qXNGA7WJOagtoGpowLi_yoHWk4rsXnND.2u3Pe0_n6VxY9F5Kw_j9KTnOYGXWU5CAje.aMjZ5QEGOnX7XNEyRNBazUZs4UpT7rQTm92VIFa2f980evMRxKc4DcQeUC13oHRGo0A38WFiAb.PUwyR8RrurjXAIMDe5CsICxKo2KjXU1qqZqnhw3d5NRIzAa6sprkM7As.aZO4yZR74lBFK4hjH32.l5MIUUI577N0AnjWh0B.WxISv18spiQubDReNJo0cnFGVZ.5kSze8taZ6cRzwZm9_Z0AgoAPXpmwIL3ZePLYaDyMYZ7UyeSZg0ckxh0Vvibj1a9zNfqtg7WVAORP_W0GH2cMS_W5SxNA0Nj8pi1fEuYrqYAGrXUHDFrOGpwd37Fr9EbKF5EQRaUCBXJ_9SOwNlJ.3hDANufX608uevaVae6nCnC1o9M2qpb_TUn0Si6lVYG3nOP7rxHIUd7OK6J7wT7RxzwVUZSirFyYMUHd1M1YBg5lBF6DlhGND.sCH9jOluCHHS.XIEYqisaTCY7XPb1u_hAowqrvfAT1CghW0hWonbt9qMcmpCAc44k2eKK4Tw0qAoaqdI9qhHJcqkX280rtO9sgmoaDakN0L1cCmM84Ya8Nq9q_2aFfelXdY0UcKLL6gEgn21Vpd.DRh.upUGmbgCAiRScRtWA2UEMV2BYVDXRQ1OLUoyxjme1Vka2zC7spHQudIM0pwF8biViDSRLKUfLAUUM9z6RxFSYShpwSKWn6iie.TdpnoOIJZyq307EWGgWFV8c2dGdGzUxp.yq5LG9oDics0Xs1Ku.Jltnl9WXc4ydG70jZZjhwniLaDqQRWpQ6R_PycpiDcrS_tZE2WL6yXjtpB.xY6SPZyhFywFINpl_1W78d_qqrd.xa2EMrZspIvrC6cDmBznYStBeQAzMbakK3jhPNVJGBEc6D2KLvvmwzD4S0M8R.jyq5kxlT__qnkPFDHQPzpxaTJWin9b12hTfB6uxg8gWBpFuONZhV92r3MLepg39Q3Ddq.jlw.aC96nImN1YRNfkcAWqLy6W29TrzBwzV2xlmHSLPfYmrv2_BycbL2bNzrLyvqjvWCU4gJSwRgf36gDkvsTivUGpU2zVi8EuPt_3v7dP3wOeGzymXzVrVjBrD0tqXhRsBt0VCPOTS.GHUWYnQe2oq0l0HdPNDCuMmVltB8gGN4pdkxcStLe2PdFB6XI_WNqk6bG0tq3sRZsmFD9W1qhrbKHBFztLEy8VmeciJHZh_U_qSqv04NACE2pw2HAtM3864EKREEmMy_FMmmdrycctg4GwJFhjEMGX5Vqe.vyAynn1NpcBAAFhXrDWV4mKkwsVUly7MNYngN436QRYJTqEkJVHm_7"};var cpo = document.createElement('script');cpo.src = '/cdn-cgi/challenge-platform/h/g/orchestrate/chl_page/v1?ray=92d3eb0d0b0aab53';window._cf_chl_opt.cOgUHash = location.hash === '' && location.href.indexOf('#') !== -1 ? '#' : location.hash;window._cf_chl_opt.cOgUQuery = location.search === '' && location.href.slice(0, location.href.length - window._cf_chl_opt.cOgUHash.length).indexOf('?') !== -1 ? '?' : location.search;if (window.history && window.history.replaceState) {var ogU = location.pathname + window._cf_chl_opt.cOgUQuery + window._cf_chl_opt.cOgUHash;history.replaceState(null, null, "\/?language=hindi&__cf_chl_rt_tk=9kSHS8fBxfknx9EyMNboQqTfhbUHzF_hsh2sgVo_qbQ-1744137888-1.0.1.1-cFp8Tmv1sEBrLlLzkvzPmJV90DJl6X0Fho6ClxX4WBI" + window._cf_chl_opt.cOgUHash);cpo.onload = function() {history.replaceState(null, null, ogU);}}document.getElementsByTagName('head')[0].appendChild(cpo);}());</script></body></html>