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 A303081 #4 Apr 18 2018 12:19:08 %S A303081 1,72,258,1455,11767,84474,615471,4647197,35089147,266582788, %T A303081 2040291566,15688494163,121138647551,938798080313,7297261476590, %U A303081 56863460415074,444030008288805,3473279096665275,27207246337447767,213372255333189453 %N A303081 Number of nX5 0..1 arrays with every element equal to 0, 2, 3, 4 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero. %C A303081 Column 5 of A303084. %H A303081 R. H. Hardin, <a href="/A303081/b303081.txt">Table of n, a(n) for n = 1..210</a> %e A303081 Some solutions for n=5 %e A303081 ..0..0..0..0..0. .0..0..0..1..1. .0..1..0..1..1. .0..0..0..0..0 %e A303081 ..1..0..1..0..0. .0..0..1..1..1. .1..1..1..1..0. .0..0..0..0..1 %e A303081 ..1..0..1..0..1. .1..0..0..0..1. .1..1..0..1..1. .0..0..0..0..1 %e A303081 ..0..0..0..0..0. .0..0..0..1..1. .0..1..1..1..1. .0..0..0..0..0 %e A303081 ..0..0..1..0..1. .1..0..0..1..1. .0..1..1..1..0. .1..0..1..0..1 %Y A303081 Cf. A303084. %K A303081 nonn %O A303081 1,2 %A A303081 _R. H. Hardin_, Apr 18 2018