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 A302956 #4 Apr 16 2018 11:43:32 %S A302956 0,111,3815,80589,2104533,58679318,1596912288,43234526916, %T A302956 1172920595173,31835504010739,863919963653140,23443241891419774, %U A302956 636163926665744028,17263226518198169813,468461872965045734740,12712366216384150285383 %N A302956 Number of 5Xn 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 A302956 Row 5 of A302953. %H A302956 R. H. Hardin, <a href="/A302956/b302956.txt">Table of n, a(n) for n = 1..210</a> %H A302956 R. H. Hardin, <a href="/A302956/a302956.txt">Empirical recurrence of order 73</a> %F A302956 Empirical recurrence of order 73 (see link above) %e A302956 Some solutions for n=5 %e A302956 ..0..0..0..0..0. .0..0..0..0..0. .0..0..0..0..0. .0..0..0..0..0 %e A302956 ..0..0..0..1..0. .0..0..0..1..0. .0..1..0..1..0. .0..0..0..1..1 %e A302956 ..0..1..1..1..1. .1..0..1..1..1. .1..0..1..0..1. .0..0..1..1..1 %e A302956 ..0..0..0..0..1. .1..1..0..0..0. .0..1..1..0..0. .0..1..1..0..1 %e A302956 ..0..1..1..1..1. .1..1..1..1..0. .1..1..1..0..0. .0..0..0..0..0 %Y A302956 Cf. A302953. %K A302956 nonn %O A302956 1,2 %A A302956 _R. H. Hardin_, Apr 16 2018