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 A302949 #4 Apr 16 2018 11:38:28 %S A302949 2,46,519,6531,80589,998670,12365841,153141597,1896492042,23486107930, %T A302949 290851104799,3601890066510,44605681284501,552395208564836, %U A302949 6840843079654058,84716763151740480,1049129453065059314 %N A302949 Number of nX4 0..1 arrays with every element equal to 1, 2, 3, 4 or 5 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero. %C A302949 Column 4 of A302953. %H A302949 R. H. Hardin, <a href="/A302949/b302949.txt">Table of n, a(n) for n = 1..210</a> %F A302949 Empirical: a(n) = 9*a(n-1) +41*a(n-2) +29*a(n-3) -181*a(n-4) -466*a(n-5) -225*a(n-6) +66*a(n-7) +298*a(n-8) -52*a(n-9) +57*a(n-10) -10*a(n-11) -25*a(n-12) +4*a(n-13) %e A302949 Some solutions for n=5 %e A302949 ..0..0..0..1. .0..0..1..0. .0..1..0..0. .0..1..0..1. .0..0..0..0 %e A302949 ..0..0..1..1. .1..1..0..0. .1..0..0..0. .0..0..1..0. .1..0..1..0 %e A302949 ..0..0..0..1. .1..0..0..1. .0..1..0..0. .0..1..0..0. .0..1..0..1 %e A302949 ..0..0..1..0. .1..0..1..0. .0..0..0..1. .0..1..0..0. .0..0..1..1 %e A302949 ..1..1..0..0. .0..1..0..1. .1..1..1..0. .1..0..1..0. .1..1..1..1 %Y A302949 Cf. A302953. %K A302949 nonn %O A302949 1,1 %A A302949 _R. H. Hardin_, Apr 16 2018