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 A295412 #4 Nov 22 2017 10:36:37 %S A295412 7,126,1534,19026,240439,3019079,37927609,476686533,5990217198, %T A295412 75274793595,945936754846,11887043481205,149377582878265, %U A295412 1877141810399248,23588956324272434,296428780394920491 %N A295412 Number of nX4 0..1 arrays with each 1 horizontally or vertically adjacent to 1, 2 or 3 1s. %C A295412 Column 4 of A295416. %H A295412 R. H. Hardin, <a href="/A295412/b295412.txt">Table of n, a(n) for n = 1..210</a> %F A295412 Empirical: a(n) = 9*a(n-1) +23*a(n-2) +218*a(n-3) +534*a(n-4) +1923*a(n-5) +3128*a(n-6) -1379*a(n-7) -8708*a(n-8) -5083*a(n-9) +7804*a(n-10) +9844*a(n-11) -968*a(n-12) -6624*a(n-13) -3072*a(n-14) %e A295412 Some solutions for n=5 %e A295412 ..0..1..1..1. .0..0..0..0. .0..0..1..1. .0..0..0..0. .0..0..0..0 %e A295412 ..1..0..1..1. .0..1..1..1. .0..0..0..1. .0..1..1..0. .1..1..0..1 %e A295412 ..1..0..1..1. .1..1..0..1. .0..0..0..1. .0..0..1..0. .1..0..0..1 %e A295412 ..1..0..0..0. .0..1..0..1. .1..1..0..0. .0..0..1..1. .1..1..0..0 %e A295412 ..1..0..0..0. .0..1..0..0. .0..0..1..1. .1..1..0..1. .1..1..1..1 %Y A295412 Cf. A295416. %K A295412 nonn %O A295412 1,1 %A A295412 _R. H. Hardin_, Nov 22 2017