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 A302222 #4 Apr 03 2018 12:15:08 %S A302222 5,537,3425,38736,338204,3420704,32181643,310963650,2973099477, %T A302222 28539661221,273649285789,2623829240629,25163515492994, %U A302222 241281374262345,2313955414338689,22188973218594562,212790004250803955 %N A302222 Number of nX6 0..1 arrays with every element equal to 1, 2 or 3 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero. %C A302222 Column 6 of A302224. %H A302222 R. H. Hardin, <a href="/A302222/b302222.txt">Table of n, a(n) for n = 1..210</a> %e A302222 Some solutions for n=5 %e A302222 ..0..0..1..0..0..0. .0..0..0..0..1..1. .0..0..1..1..0..0. .0..0..1..0..1..0 %e A302222 ..0..1..1..1..0..1. .0..1..1..0..0..1. .0..0..0..1..0..0. .0..1..1..1..0..1 %e A302222 ..0..0..0..1..1..0. .0..0..1..1..0..0. .1..1..1..1..0..0. .1..0..0..1..0..0 %e A302222 ..1..1..1..0..0..0. .0..1..1..0..0..1. .0..0..0..0..1..1. .0..0..1..1..1..0 %e A302222 ..1..0..0..1..1..1. .1..0..0..1..1..0. .1..1..1..0..0..1. .0..0..1..1..0..0 %Y A302222 Cf. A302224. %K A302222 nonn %O A302222 1,1 %A A302222 _R. H. Hardin_, Apr 03 2018