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 A287225 #14 Feb 16 2025 08:33:46 %S A287225 1,1,47,8617,4437215,18283403428,478131755555352,65146261730656227552, %T A287225 51516890628947512147926356,244151636345172523021724077440553, %U A287225 6697138334086551576618194527162685383161 %N A287225 Number of matchings in the n X n knight graph. %H A287225 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/IndependentEdgeSet.html">Independent Edge Set</a> %H A287225 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/KnightGraph.html">Knight Graph</a> %H A287225 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/Matching.html">Matching</a> %Y A287225 Row sums of A302241. %Y A287225 Cf. A289200, A289202, A141243. %K A287225 nonn,more %O A287225 1,3 %A A287225 _Eric W. Weisstein_, May 22 2017 %E A287225 a(7)-a(11) from _Andrew Howroyd_, Jul 01 2017