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 A308131 #10 Feb 16 2025 08:33:55 %S A308131 0,0,0,0,864,3318960,82787609160,9795914085489952 %N A308131 Number of (undirected) Hamiltonian paths in the n X n knight graph. %H A308131 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/HamiltonianPath.html">Hamiltonian Path</a> %H A308131 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/KnightGraph.html">Knight Graph</a> %F A308131 a(n) = A165134(n)/2. %Y A308131 Cf. A165134, A169696 (3 X n), A079137 (4 X n), A083386 (5 X n), A306281 (6 X n), A306283 (7 X n). %K A308131 nonn,more,hard %O A308131 1,5 %A A308131 _Eric W. Weisstein_, May 14 2019