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 A287227 #22 Feb 16 2025 08:33:46 %S A287227 1,2,5,18,87,462,2635,16870,118969,915442,7535369,66807234,633443407, %T A287227 6354135838,67480769839,754734433310,8870886701401 %N A287227 Number of independent vertex sets and vertex covers in the n X n queen graph. %H A287227 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/IndependentVertexSet.html">Independent Vertex Set</a> %H A287227 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/QueenGraph.html">Queen Graph</a> %H A287227 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/VertexCover.html">Vertex Cover</a> %Y A287227 Row sums of A348129. %K A287227 nonn,more %O A287227 0,2 %A A287227 _Eric W. Weisstein_, May 22 2017 %E A287227 a(0)=1 prepended by _Alois P. Heinz_, Oct 01 2021 %E A287227 a(11)-a(14) from _Eric W. Weisstein_, Feb 03 2023 %E A287227 a(15) from _Eric W. Weisstein_, Feb 04 2023 %E A287227 a(16) from _Eric W. Weisstein_, Feb 10 2023