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 A302730 #4 Apr 12 2018 10:55:58 %S A302730 0,61,301,353,1307,4505,16265,46773,136935,481479,1631059,5055540, %T A302730 16067446,52668892,175365361,562163896,1807393316,5893267465, %U A302730 19311336692,62623833763,202770902304,659588139794,2152022230238,6997053941406 %N A302730 Number of 5Xn 0..1 arrays with every element equal to 1, 2, 4 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero. %C A302730 Row 5 of A302728. %H A302730 R. H. Hardin, <a href="/A302730/b302730.txt">Table of n, a(n) for n = 1..210</a> %e A302730 Some solutions for n=5 %e A302730 ..0..0..1..0..1. .0..1..1..1..0. .0..1..1..1..0. .0..1..1..0..0 %e A302730 ..1..1..0..1..1. .0..0..1..0..0. .1..0..0..0..0. .0..0..1..1..0 %e A302730 ..1..0..1..0..0. .0..1..0..1..0. .0..1..0..1..1. .0..1..0..1..0 %e A302730 ..0..0..1..0..1. .0..1..1..1..0. .0..0..0..0..0. .0..1..0..0..0 %e A302730 ..0..1..1..1..1. .0..0..1..0..0. .1..1..1..1..0. .1..0..1..1..1 %Y A302730 Cf. A302728. %K A302730 nonn %O A302730 1,2 %A A302730 _R. H. Hardin_, Apr 12 2018