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 A303408 #4 Apr 23 2018 10:40:21 %S A303408 5,45,290,2079,29411,236326,2158662,27002794,250400003,2506366395, %T A303408 27764556264,275534182736,2826711225139,29909224594535, %U A303408 304574137026271,3144849018260079,32756776290370113,336779681669267253 %N A303408 Number of nX6 0..1 arrays with every element equal to 1, 2, 4, 5 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero. %C A303408 Column 6 of A303410. %H A303408 R. H. Hardin, <a href="/A303408/b303408.txt">Table of n, a(n) for n = 1..210</a> %e A303408 Some solutions for n=5 %e A303408 ..0..1..1..0..1..0. .0..0..0..1..1..1. .0..0..1..0..1..1. .0..0..0..0..0..0 %e A303408 ..0..0..1..1..0..0. .0..0..0..1..1..1. .1..1..1..0..0..1. .0..1..0..1..0..1 %e A303408 ..1..1..1..1..1..0. .0..1..0..1..0..0. .1..0..1..0..0..0. .0..1..1..1..1..1 %e A303408 ..0..0..1..1..0..1. .0..1..1..1..0..1. .0..0..1..1..1..0. .0..0..1..1..1..0 %e A303408 ..1..1..0..1..1..1. .1..0..0..1..1..1. .1..1..0..0..1..1. .0..1..0..0..0..1 %Y A303408 Cf. A303410. %K A303408 nonn %O A303408 1,1 %A A303408 _R. H. Hardin_, Apr 23 2018