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 A303409 #4 Apr 23 2018 10:40:59 %S A303409 8,98,730,6322,160247,1716995,24386918,497878411,6748940959, %T A303409 106242067376,1858501096856,28169515094303,452053058478307, %U A303409 7483434704337764,118104298097496073,1903568189475537422,30951192368001440803 %N A303409 Number of nX7 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 A303409 Column 7 of A303410. %H A303409 R. H. Hardin, <a href="/A303409/b303409.txt">Table of n, a(n) for n = 1..210</a> %e A303409 Some solutions for n=5 %e A303409 ..0..1..0..0..1..1..1. .0..0..1..1..0..1..0. .0..0..0..1..1..0..1 %e A303409 ..0..0..1..1..0..0..0. .1..1..0..0..0..0..1. .1..1..1..0..0..1..0 %e A303409 ..1..1..0..1..0..1..0. .0..0..0..0..0..0..0. .0..0..0..0..0..0..0 %e A303409 ..0..0..0..1..1..0..1. .1..0..0..0..1..1..0. .1..0..1..1..0..0..1 %e A303409 ..1..1..0..0..1..1..1. .0..1..0..1..1..0..0. .0..1..0..0..1..1..0 %Y A303409 Cf. A303410. %K A303409 nonn %O A303409 1,1 %A A303409 _R. H. Hardin_, Apr 23 2018