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 A158651 #28 Feb 16 2025 08:33:10 %S A158651 1,24,784,343184,729237344,13089822163800,1659110130720710584, %T A158651 1635069460917798701270872,12308784500036123518164726610224, %U A158651 721833220650131890343295654587745095696,330596986686626406483380599328509951896788808144 %N A158651 Number of directed Hamiltonian paths on the n X n king graph. %C A158651 Number of open directed king's tours on the n X n board. %H A158651 Ville H. Pettersson, <a href="http://www.combinatorics.org/ojs/index.php/eljc/article/view/v21i4p7">Enumerating Hamiltonian Cycles</a>, The Electronic Journal of Combinatorics, Volume 21, Issue 4, 2014. %H A158651 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/HamiltonianPath.html">Hamiltonian Path</a> %H A158651 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/KingGraph.html">King Graph</a> %H A158651 <a href="/index/Gra#graphs">Index entries for sequences related to graphs, Hamiltonian</a> %Y A158651 Cf. A003763, A096969, A137891, A140521. %K A158651 nonn,more %O A158651 1,2 %A A158651 _Eric W. Weisstein_, Mar 23 2009 %E A158651 a(5) from _Max Alekseyev_, May 03 2009 %E A158651 a(6)-a(11) from _Andrew Howroyd_, Nov 15 2015