This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A370210 #32 May 27 2025 14:59:22 %S A370210 0,0,0,3,15,97,597,5098,47746,582342,7691278,125339157,2195109753, %T A370210 45664819407,1013323126923,26022340062564,709267685968788, %U A370210 21939269071805596,717007984481424300,26196923530426606903,1007535882284116545523,42808941242555092330701 %N A370210 Number of chordless cycles in the n X n black bishop graph. %H A370210 Andrew Howroyd, <a href="/A370210/b370210.txt">Table of n, a(n) for n = 1..200</a> %H A370210 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/BlackBishopGraph.html">Black Bishop Graph</a>. %H A370210 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/ChordlessCycle.html">Chordless Cycle</a>. %F A370210 For n > 1, a(n) = A370224(n) - A303542(n). %o A370210 (PARI) \\ CCGenRook, Bishop defined in A370224. %o A370210 a(n) = subst(CCGenRook(Bishop(n,0)), y, 1) \\ _Andrew Howroyd_, May 27 2025 %Y A370210 Cf. A303542 (white bishop graph), A370224 (bishop graph). %K A370210 nonn %O A370210 1,4 %A A370210 _Eric W. Weisstein_, Feb 12 2024 %E A370210 a(21) onwards from _Andrew Howroyd_, May 27 2025