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 A302672 #4 Apr 11 2018 12:01:23 %S A302672 0,361,2802,21949,316977,3640304,46360666,582115385,7102982284, %T A302672 89673817840,1109953847172,13832059626512,172620198739923, %U A302672 2146228140110545,26771858593225105,333424179617097795 %N A302672 Number of 6Xn 0..1 arrays with every element equal to 1, 2, 3 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero. %C A302672 Row 6 of A302670. %H A302672 R. H. Hardin, <a href="/A302672/b302672.txt">Table of n, a(n) for n = 1..210</a> %e A302672 Some solutions for n=5 %e A302672 ..0..0..0..1..1. .0..0..0..1..1. .0..0..0..1..1. .0..0..1..0..0 %e A302672 ..0..0..1..0..0. .1..1..0..1..1. .1..1..1..0..1. .0..0..0..1..0 %e A302672 ..1..1..1..0..1. .1..1..0..1..0. .1..0..0..0..0. .1..1..1..1..1 %e A302672 ..0..0..0..1..0. .1..1..0..0..0. .0..1..0..1..1. .0..0..0..0..1 %e A302672 ..1..1..0..1..1. .1..0..0..1..0. .1..1..0..1..0. .1..0..1..1..0 %e A302672 ..0..0..0..1..1. .1..1..0..0..1. .0..0..1..0..0. .1..1..0..1..1 %Y A302672 Cf. A302670. %K A302672 nonn %O A302672 1,2 %A A302672 _R. H. Hardin_, Apr 11 2018