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 A303239 #4 Apr 20 2018 10:53:24 %S A303239 1,34,60,255,1106,5158,23995,108726,506416,2400455,11206914,52620426, %T A303239 248789167,1172758534,5532271468,26154017151,123634836850, %U A303239 584566350050,2765874355363,13089996381214,61961733243948,293379713085303 %N A303239 Number of nX5 0..1 arrays with every element equal to 0, 2, 3, 5 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero. %C A303239 Column 5 of A303242. %H A303239 R. H. Hardin, <a href="/A303239/b303239.txt">Table of n, a(n) for n = 1..210</a> %e A303239 Some solutions for n=5 %e A303239 ..0..0..1..0..0. .0..0..1..0..0. .0..1..0..0..0. .0..0..1..1..1 %e A303239 ..1..0..0..0..1. .0..0..0..0..1. .1..1..1..0..0. .0..0..0..1..1 %e A303239 ..1..0..1..0..1. .1..1..1..0..0. .0..1..0..0..0. .0..0..0..1..0 %e A303239 ..0..0..0..0..0. .0..1..1..0..0. .0..1..1..0..1. .0..0..0..1..1 %e A303239 ..1..0..1..0..0. .1..1..1..0..0. .0..1..1..0..1. .0..0..1..1..0 %Y A303239 Cf. A303242. %K A303239 nonn %O A303239 1,2 %A A303239 _R. H. Hardin_, Apr 20 2018