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 A302263 #4 Apr 04 2018 12:49:18 %S A302263 32,1405,19191,284428,4289139,64975832,982041385,14850510984, %T A302263 224584502616,3396894785618,51378080369692,777114464739294, %U A302263 11754193622516512,177788578767001402,2689153640060642062 %N A302263 Number of nX6 0..1 arrays with every element equal to 0, 1, 2 or 3 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero. %C A302263 Column 6 of A302265. %H A302263 R. H. Hardin, <a href="/A302263/b302263.txt">Table of n, a(n) for n = 1..210</a> %e A302263 Some solutions for n=5 %e A302263 ..0..1..1..1..0..0. .0..0..1..1..1..0. .0..0..1..0..1..1. .0..1..1..0..0..0 %e A302263 ..1..0..1..0..1..1. .1..0..1..0..0..1. .1..0..1..0..1..0. .1..0..1..1..1..0 %e A302263 ..0..1..0..0..1..0. .0..0..0..1..1..0. .0..1..0..0..1..1. .0..1..0..0..0..1 %e A302263 ..0..1..0..1..0..0. .1..1..0..1..1..0. .0..1..0..1..1..1. .1..1..0..1..1..0 %e A302263 ..1..0..0..1..1..1. .1..1..0..0..1..0. .1..0..1..0..0..0. .0..0..0..1..1..0 %Y A302263 Cf. A302265. %K A302263 nonn %O A302263 1,1 %A A302263 _R. H. Hardin_, Apr 04 2018