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 A234603 #13 Feb 16 2025 08:33:21 %S A234603 2,53,12424,12300529,504040211574,84649132742336262, %T A234603 1080241691057266946999792 %N A234603 Numbers of undirected cycles in the n X n black bishop graph. %H A234603 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/BlackBishopGraph.html">Black Bishop Graph</a> %H A234603 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/GraphCycle.html">Graph Cycle</a> %Y A234603 Cf. A234630, A234636, A234624, A282889, A234632. %K A234603 nonn,hard,more %O A234603 3,1 %A A234603 _Eric W. Weisstein_, Dec 28 2013 %E A234603 a(7) from _Eric W. Weisstein_, Jan 04 2014 %E A234603 a(3) prepended and a(8)-a(9) from _Andrew Howroyd_, May 08 2017