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 A055903 #6 Aug 17 2021 02:49:01 %S A055903 1,15,141,939,4971,21981,84351,287961,891564,2539756,6733764,16769916, %T A055903 39526524,88722756,190653804,393952284,785736369,1517620599, %U A055903 2846653381,5198360739,9261986019,16131790389,27513326919,46020006201 %N A055903 Column 7 of triangle A055898. %H A055903 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_7 for square lattices of Section 6). %Y A055903 Cf. A055898. %K A055903 nonn %O A055903 7,2 %A A055903 _Christian G. Bower_, Jun 13 2000