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 A238816 #10 Jun 30 2023 12:17:49 %S A238816 1,4,44,2828,564468,754425400,3079904455096,88444819222239178, %T A238816 7685637690960745082050,4793315937811919497089287562 %N A238816 Number of Hamiltonian cycles on 2n X 2n grid with at least the symmetry of reflection in an axis. %H A238816 Ed Wynn, <a href="http://arxiv.org/abs/1402.0545">Enumeration of nonisomorphic Hamiltonian cycles on square grid graphs</a>, arXiv preprint arXiv:1402.0545 [math.CO], 2014. %Y A238816 Cf. A003763. %K A238816 nonn,more %O A238816 1,2 %A A238816 _N. J. A. Sloane_, Mar 05 2014