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 A303252 #4 Apr 20 2018 11:08:10 %S A303252 5,537,4556,78679,1218385,19457754,306224454,4895684572,77683246701, %T A303252 1234426654421,19631272724800,312041675243059,4960178416591981, %U A303252 78856852121294934,1253577822147874492,19928141716104516026 %N A303252 Number of nX6 0..1 arrays with every element equal to 1, 2, 3, 5 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero. %C A303252 Column 6 of A303254. %H A303252 R. H. Hardin, <a href="/A303252/b303252.txt">Table of n, a(n) for n = 1..210</a> %e A303252 Some solutions for n=5 %e A303252 ..0..1..1..0..1..0. .0..0..0..0..0..1. .0..0..0..0..1..1. .0..0..1..0..0..0 %e A303252 ..0..0..1..0..0..1. .0..0..1..1..1..0. .0..1..1..0..1..0. .0..0..0..1..1..1 %e A303252 ..0..0..1..0..0..0. .0..1..0..0..0..1. .0..1..0..1..0..1. .0..0..0..0..1..1 %e A303252 ..0..1..1..0..1..0. .1..0..1..1..1..0. .0..0..0..0..1..1. .0..1..1..1..0..1 %e A303252 ..0..0..0..1..1..1. .0..1..1..0..0..1. .0..1..1..1..1..1. .0..0..1..1..0..0 %Y A303252 Cf. A303254. %K A303252 nonn %O A303252 1,1 %A A303252 _R. H. Hardin_, Apr 20 2018