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 A303717 #4 Apr 29 2018 10:53:20 %S A303717 13,13,24,76,169,343,741,1618,3451,7390,15924,34201,73387,157681, %T A303717 338754,727483,1562542,3356380,7209057,15484111,33258613,71436250, %U A303717 153437331,329568094,707879620,1520453233,3265779603,7014566209,15066579706 %N A303717 Number of nX6 0..1 arrays with every element unequal to 0, 1 or 5 king-move adjacent elements, with upper left element zero. %C A303717 Column 6 of A303719. %H A303717 R. H. Hardin, <a href="/A303717/b303717.txt">Table of n, a(n) for n = 1..210</a> %F A303717 Empirical: a(n) = a(n-1) +a(n-2) +3*a(n-3) +a(n-4) -a(n-5) -a(n-6) for n>9 %e A303717 Some solutions for n=5 %e A303717 ..0..1..0..0..0..0. .0..0..0..1..0..0. .0..1..0..0..1..0. .0..0..0..0..1..0 %e A303717 ..0..0..0..0..0..1. .0..0..0..0..0..0. .0..0..0..0..0..0. .0..0..0..0..0..0 %e A303717 ..0..0..0..0..0..0. .0..0..0..0..0..0. .0..0..0..0..0..0. .0..0..0..0..0..0 %e A303717 ..0..0..0..0..0..0. .1..0..0..0..0..1. .0..0..0..0..0..0. .1..0..0..0..0..0 %e A303717 ..0..1..0..0..0..0. .0..0..0..0..0..0. .0..0..0..0..1..0. .0..0..0..0..0..0 %Y A303717 Cf. A303719. %K A303717 nonn %O A303717 1,1 %A A303717 _R. H. Hardin_, Apr 29 2018