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 A287248 #17 Feb 16 2025 08:33:46 %S A287248 1,4,84,16900,39932844,1361720957184,774585118899294568, %T A287248 8454365006540284439239696,1984702974673190711327564424138048, %U A287248 11162924792761237570313905721795529333447744,1649914801339506800304019030963996680128410488784164960,6996584578812582654135225585307693014250183123864863361126056356416,919794116459365136444247186352581193250325236478988411540394596132809895149151936 %N A287248 Number of matchings in the n X n bishop graph. %H A287248 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/BishopGraph.html">Bishop Graph</a> %H A287248 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/IndependentEdgeSet.html">Independent Edge Set</a> %H A287248 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/Matching.html">Matching</a> %F A287248 a(n) = A286422(n) * A286423(n). - _Andrew Howroyd_, May 23 2017 %Y A287248 Cf. A286422, A286423. %K A287248 nonn %O A287248 1,2 %A A287248 _Eric W. Weisstein_, May 22 2017