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 A303323 #4 Apr 21 2018 13:12:06 %S A303323 1,32,1,10,25,56,136,531,1035,3668,11020,29763,88919,263974,759319, %T A303323 2234940,6528470,19011183,55808342,163149056,476147024,1393878718, %U A303323 4076631347,11916304345,34854245923,101919861889,298028780792 %N A303323 Number of nX6 0..1 arrays with every element equal to 0, 2, 4, 5 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero. %C A303323 Column 6 of A303325. %H A303323 R. H. Hardin, <a href="/A303323/b303323.txt">Table of n, a(n) for n = 1..210</a> %e A303323 Some solutions for n=5 %e A303323 ..0..1..1..1..1..1. .0..0..0..0..0..1. .0..0..0..0..1..1. .0..0..0..0..1..1 %e A303323 ..0..1..1..1..1..1. .0..0..0..0..0..1. .0..0..0..0..1..1. .0..0..0..0..1..1 %e A303323 ..1..1..1..1..0..1. .0..1..0..1..0..1. .0..1..0..1..0..1. .0..1..0..0..0..0 %e A303323 ..0..0..1..1..1..1. .0..0..0..0..0..1. .0..0..0..0..1..1. .0..0..0..0..0..1 %e A303323 ..0..0..1..1..1..1. .0..0..0..0..0..1. .0..0..0..0..1..1. .0..0..0..0..0..1 %Y A303323 Cf. A303325. %K A303323 nonn %O A303323 1,2 %A A303323 _R. H. Hardin_, Apr 21 2018