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 A295116 #4 Nov 15 2017 06:17:42 %S A295116 4,20,77,326,1373,5793,24347,102398,431050,1813753,7631302,32111207, %T A295116 135119039,568549155,2392325744,10066404116,42357266765,178230161368, %U A295116 749953993371,3155644584471,13278270334423,55872091215736 %N A295116 Number of nX4 0..1 arrays with each 1 horizontally or vertically adjacent to 1 or 4 1s. %C A295116 Column 4 of A295120. %H A295116 R. H. Hardin, <a href="/A295116/b295116.txt">Table of n, a(n) for n = 1..210</a> %F A295116 Empirical: a(n) = a(n-1) +5*a(n-2) +22*a(n-3) +43*a(n-4) +52*a(n-5) +35*a(n-6) +35*a(n-7) +21*a(n-8) +14*a(n-9) +6*a(n-10) +9*a(n-11) -7*a(n-12) -a(n-14) %e A295116 Some solutions for n=7 %e A295116 ..1..1..0..1. .0..0..0..0. .0..0..0..1. .0..1..1..0. .1..0..0..0 %e A295116 ..0..0..0..1. .1..0..1..1. .0..0..0..1. .1..0..0..1. .1..0..0..1 %e A295116 ..0..0..0..0. .1..0..0..0. .0..0..1..0. .1..0..0..1. .0..0..0..1 %e A295116 ..0..0..0..0. .0..0..0..0. .0..1..1..1. .0..0..0..0. .1..1..0..0 %e A295116 ..0..1..1..0. .1..0..0..0. .0..0..1..0. .1..1..0..0. .0..0..0..0 %e A295116 ..0..0..0..0. .1..0..0..1. .0..0..0..1. .0..0..0..0. .0..0..0..0 %e A295116 ..0..0..0..0. .0..0..0..1. .0..0..0..1. .0..0..1..1. .0..0..1..1 %Y A295116 Cf. A295120. %K A295116 nonn %O A295116 1,1 %A A295116 _R. H. Hardin_, Nov 15 2017