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 A295038 #4 Nov 12 2017 20:04:20 %S A295038 21,876,19956,528282,13706771,355281224,9248214732,240292442848, %T A295038 6243986963713,162252303626409,4216381439247094,109570922468132003, %U A295038 2847344541437365138,73992200911927723171,1922796991924326509127 %N A295038 Number of nX6 0..1 arrays with each 1 horizontally or vertically adjacent to 1 or 2 1s. %C A295038 Column 6 of A295040. %H A295038 R. H. Hardin, <a href="/A295038/b295038.txt">Table of n, a(n) for n = 1..210</a> %e A295038 Some solutions for n=3 %e A295038 ..1..0..0..1..0..0. .1..1..0..1..1..1. .0..0..0..1..0..1. .0..0..0..0..0..1 %e A295038 ..1..0..0..1..1..0. .1..0..1..0..0..1. .1..1..0..1..0..1. .0..1..0..1..0..1 %e A295038 ..1..0..0..0..1..0. .0..0..1..0..0..0. .0..1..0..0..0..0. .1..1..0..1..0..0 %Y A295038 Cf. A295040. %K A295038 nonn %O A295038 1,1 %A A295038 _R. H. Hardin_, Nov 12 2017