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 A268838 #22 Feb 16 2025 08:33:30 %S A268838 1,4,756,45696,2955700,560028096,126412047692,93784124187136 %N A268838 Number of (undirected) Hamiltonian paths in the torus grid graph C_n X C_n. %C A268838 Here, X (sometimes also written \square) is the graph Cartesian product. %H A268838 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 A268838 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/HamiltonianPath.html">Hamiltonian Path</a> %H A268838 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/TorusGridGraph.html">Torus Grid Graph</a> %Y A268838 Cf. A003763, A222199, A120443, A268894. %K A268838 nonn,more %O A268838 1,2 %A A268838 _Andrew Howroyd_, Feb 14 2016