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 A303310 #4 Apr 21 2018 12:45:40 %S A303310 5,5,17,36,74,165,361,783,1710,3744,8176,17851,39009,85239,186206, %T A303310 406800,888794,1941803,4242301,9268393,20249240,44239542,96652372, %U A303310 211161719,461336399,1007905991,2202025876,4810883806,10510594448,22963055655 %N A303310 Number of nX4 0..1 arrays with every element equal to 0, 1, 4, 5 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero. %C A303310 Column 4 of A303314. %H A303310 R. H. Hardin, <a href="/A303310/b303310.txt">Table of n, a(n) for n = 1..210</a> %F A303310 Empirical: a(n) = a(n-1) +a(n-2) +3*a(n-3) +2*a(n-4) -a(n-5) -2*a(n-6) -a(n-7) for n>10 %e A303310 Some solutions for n=5 %e A303310 ..0..0..0..1. .0..1..1..1. .0..1..0..0. .0..1..0..1. .0..1..1..1 %e A303310 ..0..1..0..1. .0..1..0..1. .0..1..1..1. .0..0..0..1. .0..1..0..1 %e A303310 ..0..1..0..1. .0..0..0..1. .0..1..0..1. .0..1..0..1. .0..1..0..1 %e A303310 ..0..1..0..1. .0..1..1..1. .0..1..0..1. .0..1..1..1. .0..1..0..1 %e A303310 ..0..1..0..1. .0..1..0..0. .0..1..0..1. .0..1..0..0. .0..0..0..1 %Y A303310 Cf. A303314. %K A303310 nonn %O A303310 1,1 %A A303310 _R. H. Hardin_, Apr 21 2018