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 A297666 #8 Feb 16 2025 08:33:52 %S A297666 0,0,1,64,651,4680,56919,2578420,205224704 %N A297666 Number of chordless cycles in the n X n knight graph. %H A297666 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/ChordlessCycle.html">Chordless Cycle</a> %H A297666 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/KnightGraph.html">Knight Graph</a> %Y A297666 Cf. A001230, A234623. %K A297666 nonn,more %O A297666 1,4 %A A297666 _Eric W. Weisstein_, Jan 02 2018 %E A297666 a(6)-a(9) from _Andrew Howroyd_, Jan 08 2018