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 A302668 #4 Apr 11 2018 11:58:20 %S A302668 5,537,3425,38736,352174,3640304,35549458,353912413,3503182605, %T A302668 34733392242,344383586201,3413092993197,33838324669263, %U A302668 335406192214163,3325046165086088,32959991923444290,326735142581592322 %N A302668 Number of nX6 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 A302668 Column 6 of A302670. %H A302668 R. H. Hardin, <a href="/A302668/b302668.txt">Table of n, a(n) for n = 1..210</a> %e A302668 Some solutions for n=5 %e A302668 ..0..0..0..0..1..1. .0..0..1..1..1..1. .0..0..1..1..1..1. .0..0..1..0..0..0 %e A302668 ..0..1..1..0..1..1. .0..1..0..0..0..1. .0..0..0..0..0..1. .0..1..1..1..1..1 %e A302668 ..1..0..1..0..0..1. .0..0..1..1..1..1. .1..1..1..1..0..0. .1..0..0..0..0..1 %e A302668 ..0..1..0..1..1..0. .1..0..1..0..0..0. .0..1..0..0..0..1. .0..1..1..0..0..1 %e A302668 ..0..0..1..1..0..0. .0..1..1..1..0..0. .0..0..1..0..1..1. .0..0..1..1..1..1 %Y A302668 Cf. A302670. %K A302668 nonn %O A302668 1,1 %A A302668 _R. H. Hardin_, Apr 11 2018