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 A303038 #4 Apr 17 2018 13:22:17 %S A303038 13,113,150,869,3069,13597,63254,298328,1487003,7748342,41876150, %T A303038 234739185,1358331357,8044921674,48567141833,297402619344, %U A303038 1839614527950,11463650530293,71813104193006,451521024746927,2846294049645254 %N A303038 Number of nX6 0..1 arrays with every element equal to 0, 1, 3, 4 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero. %C A303038 Column 6 of A303040. %H A303038 R. H. Hardin, <a href="/A303038/b303038.txt">Table of n, a(n) for n = 1..210</a> %e A303038 Some solutions for n=5 %e A303038 ..0..1..0..1..1..0. .0..1..0..1..1..1. .0..1..0..1..0..1. .0..0..1..0..1..0 %e A303038 ..0..1..0..1..0..1. .0..1..0..1..0..1. .1..0..0..1..1..0. .0..1..0..0..1..0 %e A303038 ..0..1..0..1..0..1. .0..1..0..1..0..1. .1..0..1..0..1..0. .0..1..0..0..0..0 %e A303038 ..0..1..0..1..0..1. .0..1..0..1..0..1. .1..0..1..0..1..0. .0..1..1..0..1..0 %e A303038 ..0..0..1..1..0..1. .0..1..0..0..1..1. .1..0..1..0..1..0. .0..1..0..1..1..0 %Y A303038 Cf. A303040. %K A303038 nonn %O A303038 1,1 %A A303038 _R. H. Hardin_, Apr 17 2018