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 A055902 #6 Aug 17 2021 02:48:56 %S A055902 1,13,106,615,2850,11087,37626,114177,315805,807520,1930600,4354140, %T A055902 9331560,19117980,37630440,71461368,131399829,234661713,408100330, %U A055902 692741335,1150092658,1870787919,2986277658,4684437485,7230182505 %N A055902 Column 6 of triangle A055898. %H A055902 A. J. Guttmann, <a href="https://doi.org/10.1016/S0012-365X(99)00262-9">Indicators of solvability for lattice models</a>, Discrete Math., 217 (2000), 167-189 (H_6 for square lattices of Section 6). %Y A055902 Cf. A055898. %K A055902 nonn %O A055902 6,2 %A A055902 _Christian G. Bower_, Jun 13 2000