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 A303474 #4 Apr 24 2018 10:46:55 %S A303474 64,8192,240109,8511918,302023677,10589284528,373571747330, %T A303474 13168795781782,464090568326205,16358580942971076,576597835196073800, %U A303474 20323581029125802804,716356995061667848093,25249828305783449920908 %N A303474 Number of 7Xn 0..1 arrays with every element equal to 0, 1, 2, 3, 5 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero. %C A303474 Row 7 of A303469. %H A303474 R. H. Hardin, <a href="/A303474/b303474.txt">Table of n, a(n) for n = 1..210</a> %e A303474 Some solutions for n=5 %e A303474 ..0..0..0..0..0. .0..0..0..0..0. .0..0..0..0..0. .0..0..0..0..0 %e A303474 ..0..0..1..1..0. .0..0..1..1..0. .0..0..1..1..0. .0..0..1..1..0 %e A303474 ..1..0..1..0..0. .1..0..1..0..0. .1..0..1..0..0. .0..0..0..0..1 %e A303474 ..0..1..1..0..1. .0..0..1..0..0. .0..1..1..0..1. .1..0..1..0..0 %e A303474 ..1..0..1..0..1. .0..1..1..0..1. .0..1..0..0..1. .1..1..1..1..1 %e A303474 ..1..0..0..1..1. .0..0..0..1..1. .0..1..0..1..1. .1..1..0..0..0 %e A303474 ..0..1..0..1..0. .0..1..0..1..0. .1..1..0..1..1. .0..1..0..0..1 %Y A303474 Cf. A303469. %K A303474 nonn %O A303474 1,1 %A A303474 _R. H. Hardin_, Apr 24 2018