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 A282889 #13 Feb 16 2025 08:33:42 %S A282889 0,8,1408,1106016,27605259264,3564317860276224,28463849350128000663552 %N A282889 Number of directed Hamiltonian cycles on the n X n black bishop graph. %H A282889 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/BlackBishopGraph.html">Black Bishop Graph</a> %H A282889 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/HamiltonianCycle.html">Hamiltonian Cycle</a> %Y A282889 Cf. A282890 (numbers of Hamiltonian cycles in an n X n white bishop graph) %K A282889 nonn,hard,more %O A282889 3,2 %A A282889 _Eric W. Weisstein_, Feb 24 2017 %E A282889 a(9) from _Andrew Howroyd_, May 06 2017