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 A303426 #4 Apr 23 2018 10:58:58 %S A303426 64,8192,976132,116529645,13965759339,1673515027797,200493397340704, %T A303426 24020147098755633,2877772423900833546,344775872442750250950, %U A303426 41306367066392211719403,4948768734344656216522215 %N A303426 Number of 7Xn 0..1 arrays with every element equal to 0, 1, 2, 3, 4 or 5 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero. %C A303426 Row 7 of A303421. %H A303426 R. H. Hardin, <a href="/A303426/b303426.txt">Table of n, a(n) for n = 1..210</a> %e A303426 Some solutions for n=5 %e A303426 ..0..0..0..0..0. .0..0..0..0..0. .0..0..0..0..0. .0..0..0..0..0 %e A303426 ..0..0..0..0..0. .0..0..0..0..0. .0..0..0..0..0. .0..0..0..0..0 %e A303426 ..0..0..1..1..0. .0..0..1..1..0. .0..0..1..1..0. .0..0..1..1..0 %e A303426 ..0..0..0..1..1. .0..0..0..1..0. .0..0..0..1..0. .0..0..0..0..1 %e A303426 ..0..1..1..0..0. .1..0..1..1..1. .0..1..1..1..1. .1..1..0..0..0 %e A303426 ..0..1..1..1..1. .1..0..1..0..1. .0..1..1..1..0. .1..1..1..1..1 %e A303426 ..0..0..1..0..0. .0..1..1..0..1. .1..1..1..0..1. .0..1..1..1..0 %Y A303426 Cf. A303421. %K A303426 nonn %O A303426 1,1 %A A303426 _R. H. Hardin_, Apr 23 2018