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 A303329 #4 Apr 21 2018 13:16:36 %S A303329 64,1,64,3,204,136,2956,3929,69328,130531,2005898,4227664,61153964, %T A303329 138433606,1895471346,4533018431,59124000419,148573817239, %U A303329 1850543645961,4870321182842,58066023583621,159666967568560,1825934714066510 %N A303329 Number of 7Xn 0..1 arrays with every element equal to 0, 2, 4, 5 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero. %C A303329 Row 7 of A303325. %H A303329 R. H. Hardin, <a href="/A303329/b303329.txt">Table of n, a(n) for n = 1..210</a> %e A303329 Some solutions for n=5 %e A303329 ..0..1..0..1..0. .0..0..0..1..0. .0..0..0..1..0. .0..0..1..0..1 %e A303329 ..1..1..1..1..1. .0..0..0..1..0. .0..0..0..1..0. .1..0..0..0..0 %e A303329 ..1..0..1..0..1. .0..1..0..1..0. .1..1..1..1..1. .0..0..0..1..0 %e A303329 ..1..1..1..1..1. .1..0..1..1..1. .1..1..1..0..1. .0..1..0..0..0 %e A303329 ..0..1..0..1..0. .1..1..1..0..1. .1..0..1..1..1. .1..0..1..0..1 %e A303329 ..0..1..0..1..0. .0..1..1..1..1. .1..1..1..1..0. .1..1..1..0..1 %e A303329 ..0..1..0..1..0. .0..1..1..1..1. .1..1..1..1..0. .0..1..0..0..0 %Y A303329 Cf. A303325. %K A303329 nonn %O A303329 1,1 %A A303329 _R. H. Hardin_, Apr 21 2018