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 A308141 #6 Feb 16 2025 08:33:55 %S A308141 0,4,756,11197440,25328684620800,14303252551164700262400, %T A308141 2979637719108524426779310260224000 %N A308141 Number of (undirected) Hamiltonian paths in the n X n rook graph. %H A308141 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/HamiltonianPath.html">Hamiltonian Path</a> %H A308141 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/RookGraph.html">Rook Graph</a> %F A308141 a(n) = A096970(n)/2. %Y A308141 Cf. A096970. %K A308141 nonn,hard,more %O A308141 1,2 %A A308141 _Eric W. Weisstein_, May 14 2019