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: '92dac93da9524cbf',cH: 'sIBLqMmoRVX1iyaJ.63sgaS_CcMfbK3oET42EQXnRXs-1744209904-1.2.1.1-qzQgWUnlpN6N77q4ul9h92dnqme3ZGKIDMgxiEicbBGmib9tgo_370FE25mhUnKI',cUPMDTk: "\/A372802?__cf_chl_tk=wV8FMd0Mq3ALWgMQHVWtabec1iFyK4oXFBpXDgMQ9uo-1744209904-1.0.1.1-35EUT3W759eIZWPqXG8vS61OZJH03pc.QG6L.aTm6cM",cFPWv: 'g',cITimeS: '1744209904',cTTimeMs: '1000',cMTimeMs: '390000',cTplC: 0,cTplV: 5,cTplB: 'cf',cK: "unsupported_browser_beacon",fa: "\/A372802?__cf_chl_f_tk=wV8FMd0Mq3ALWgMQHVWtabec1iFyK4oXFBpXDgMQ9uo-1744209904-1.0.1.1-35EUT3W759eIZWPqXG8vS61OZJH03pc.QG6L.aTm6cM",md: "rzGpJalcd3fzrPJakHv5qOsSs1kZaB0aWfLc1H40PdA-1744209904-1.2.1.1-ci721DX_g3Y4mPMROeJeZFB12EiMpqihjz9gTPLv_.UMqWktJBGv99mPBm8fNeN3kZ66hZbWGNcbbyUscTdphGER6_proOJ97aVxG8qy1VN8fqx0xM4SryqTw741JFAU4MwgUMz9QJy0FCqOta9gX7Gke8buk1tonwIfKTZHXN2KVCIRDYs4xlBwkmD9GOneIpNf0z_M69_SY8RAZBFK7pulqYdOJiyvUflVwvF_VAuypxWg.kwVkDdpZpU.cIdJQfC.MDppWJYmS_hdhJVkNL6vIDfKxDYeNGdf8lSpSD2zGiYwTBW4itbuQPPuNCACwdmC90lrD.YXj9X.qiRk_oVQyBM.WLvrLimgFAwV1mCRJ8tTA5DW5zUSQfc9PuaJfxkHmZwNRSVxBeATTKqB1lrdx0V.BEdrikTYCBxIFn9MKRBd.yhPuZRk30OzOUolsR4cLV_bfvfa.jr8BPJL.C1yvjhtjWuMFKUZ7UWM3V.sWHfi12YYT9AJwISVn1dopUIWhhqudfYh3nk7LbHxn.t62gwd_ugMuoTGnLUv_IP2MOvUTRLbh6Gnrh9TVN.HcG02MEclNd1_K7Be2kBczz7mJagkQbXxLIuP0NmJK0ZAqLRqbbPF7SuEmCTn.JIz7c8e72d450LRcsGTAv1fNZFbuusf4jQr_NFaaLH1x3rPYDMo8AYKYZ0ZfAkSZy1751xgC4PelL9eg9GFYnzpVAZxeWk4Kxs83lKFNFfNHxDv22moWd0NcV57wsXF7g2r9JXfA4sk1jyV9etyHMbVi.bDUvVPLbhLfN2AE5ZmBvYUSrJzQvpNRZsdhkxyzJTE6dKfhpYPu22QcmJHm3KYGG4GPqBdfw565HK25dJ5.HMVUvFZR7zx_JnsGJ1uQI0tHKAo6BET2hweMCFWCb4wa.iDUHygp3od1CkRGQ9flt_14EOZsTs.70FoT1fbk6IZiyke7B15FGW5vTfJoLHXCOlM00l8JF0QyAfD66dtT5nK0RhwxK30W5IiUdHTXAqlCl_INk0uekVoMmYWDqi5BGX8tmNznDInanGa1kw1JBqefnK.BrJM5jURsRcm3qzX",mdrd: "O.CCuD9CgjKTDxwxWwufghwgyHgPzxoynq6kjymXpys-1744209904-1.2.1.1-P0F7knEtDBE7_C53P.pqPmNZApJb9aPtpwWwMV6bnlsTCtXDK7s.pZXcyxPnEWcO1kt7SwG1mVMCsDD1kvv26EZ2AY38AJaVBIV.rye8lFEJvKh1gp_dDJPYarZlmyAVTlWWuEeq2KfKfhDzp5s3tpvvhLF.EKb0VieJoIs7zvI2tE3nHU2h_mg2i9Ha273JuhP5u5XseqnN64ADYz24T.gt__pNIBGxn7_O7os5aLASZ5y_pP2ToRGlby76ur0au4WEa7zgrF03IuAvqe_qNj0fESAr1x67zrbxYHaYGQR5ZcUxm8IbOCBJUYLGMalNecT0.rWP_xkBVhN7ciq7V0eWZtkGzH0oG9SqhkLWeaz9ool.VHKKm2I6vAH7XqX_mQtSuRCR9NDg_vUn5jZVNX8A.MtJDfDV3GRWonNJrcPSJg_C2vYG52FN2Tbw2NZVJyyToU.sSdPPrdVMRCyHT7b3Wq2yOUbIuWXUrQIabGLt7Lhc9_IIxOY4mWN4Ce4Vo_nbg0Yqq7q5759V31yYC8wnDgrQqZt5zM5H3Ai8VTG_OlLndV1q2d8TqItRSkaVa_stfAP_FARgNk6CA4O1j7YFLN9Yw.6J06KRP_hThYWPITqn4HBzhSmaQxeSjJbRtiQ9uT6rOSIq8fbuMD_JQ.5Bhr4qdCnHZh5OWfuKR5ksEfne5V8PFzhQajLeO0O2sPQGmDi5uBoDhSUzsBOBTP2Lr4fsTm5C9uZAiH1fWpXUlSCkTxYM.Myg2DD5WybKjkVGx.mZwLl0nQGWa78Zk4oLnRy.PsEeaNuVpin9vKGXzAv5DJfGkclPAamheG3vdKdvec9pOZZcUkjBphiYRHs6UzMS5lgk_rWRugYqUSKz75VMVJC2HKo13V8BupJzXdogeiydnSh4ihWoSMz0LFwZVVCPj4Ejmt8.KoG7QTEwQ8ya2f9yS0evu9EH06i9t7b.YtMZXpOp2CNPlHqJiaa4N.ybsQMaZE4bMTFOOMGZbjf.7tUkqc7bW2UT0aHx.kjYu5fTUZExmTsilX5BgyACHC7yax3wt5.8BuaeRLNsVycr0PUieekjs4Oi9yy2m2XxXpdhCMUmSXH.PpJbOi9B4Gu0KmuGnAKajk.kxH.qoYy0EAGZSt.jcyTCAuK5kkf6QTIVxFAJBtUCstNKcIqIsskGL7WHiRh0YnZjaojC8RdojVHmFThANp.kAw8LTcT_Qox6416I2hY3Y4k_5Y4wZPXxgjNnH.LxFA_z9fv1Gevk9BM6a12bUce6wM5xu_0abg0YHjVEjV9BkEm.FfDslX3fqCYP23DceKYGp0wh0sY5tcjPyz_FJz7f8vHDY9xbApxXVr7hy9t9GedAujMI5WMMRCHr1YrUcbqRyc3T1TrEe6cF8ye4o_wcjsuQPBGG4DJMydbTIDlSoorYSvts7bME9lb50IKW4cge5VWHQ6X0OtagYNXHhPJH9J_XJh6.yW3GWZNeO4dHvXlGq2.TW1Zm3iSspY_ZmVvpwPjJ6Bkqt1HfEp2n45kJ_902ML7OF1a_cpb9.VYVPaUPN4UsyBsIVlbwqmp9ruOmy_gb4eKcqYrruqjTZRfvLfaGIYQHVfYFUQX4JHCPT1b4cy6pJ2r0Q0fQchx9QOEyTBLzh8kPS4jH7TmiwEhEf7Y4_BX2vJgXKlbAMuIxJrlrhEHJolznu0Z5P0J6dw_cBha8UI246SOrcwpc_vcqKLzmuF4WmphmPjjTqk_ziJ6PXZrrBNfP.iTVN0qDifevtv8pJRZodUA0koqy7wLs62NxmehD0bdtoTSjCiOIs6abXrA1L9lS5thOp49_WQeElDZXtpL1g9Jp2KHWMwoGdOItZsmJt2lYr1gWPtMzXutIKSmOtyCxc3eIZsE5.5OLzlU8pPKJSRzO2S_qslsoz9V2qxq6msXtoA1EJeDNEN8FhciXYBTsMyR14NZFdiweui9ijh7hM6K30599WxGDMXVz8CJZiIQEjuIgCGKE06xB_g5itKfBYtfyB8ZmSNnI_rQ9ZY_s_tDDTzPQvZIXFJjx5grdnqa.U6S3LvbTO3gZkQ"};var cpo = document.createElement('script');cpo.src = '/cdn-cgi/challenge-platform/h/g/orchestrate/chl_page/v1?ray=92dac93da9524cbf';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, "\/A372802?__cf_chl_rt_tk=wV8FMd0Mq3ALWgMQHVWtabec1iFyK4oXFBpXDgMQ9uo-1744209904-1.0.1.1-35EUT3W759eIZWPqXG8vS61OZJH03pc.QG6L.aTm6cM" + window._cf_chl_opt.cOgUHash);cpo.onload = function() {history.replaceState(null, null, ogU);}}document.getElementsByTagName('head')[0].appendChild(cpo);}());</script></body></html>