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 A302229 #4 Apr 03 2018 12:20:10 %S A302229 0,361,2666,21777,292781,3420704,42508145,524715109,6339899565, %T A302229 78476978749,958583337489,11758190038504,144419322238672, %U A302229 1768994677452799,21718288663168847,266355912494488737 %N A302229 Number of 6Xn 0..1 arrays with every element equal to 1, 2 or 3 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero. %C A302229 Row 6 of A302224. %H A302229 R. H. Hardin, <a href="/A302229/b302229.txt">Table of n, a(n) for n = 1..210</a> %e A302229 Some solutions for n=5 %e A302229 ..0..0..1..1..1. .0..0..0..1..1. .0..0..1..1..1. .0..0..0..1..1 %e A302229 ..1..0..0..0..1. .1..0..0..1..0. .0..0..1..0..0. .0..1..1..0..1 %e A302229 ..1..1..0..1..1. .1..1..1..0..1. .0..1..1..1..0. .1..1..1..0..1 %e A302229 ..0..1..1..0..0. .0..0..0..0..1. .1..1..0..0..0. .0..0..0..1..1 %e A302229 ..0..0..1..0..1. .0..1..1..1..0. .0..1..1..1..1. .1..1..0..1..0 %e A302229 ..1..1..0..1..1. .1..1..0..0..1. .0..0..1..0..0. .1..1..0..0..1 %Y A302229 Cf. A302224. %K A302229 nonn %O A302229 1,2 %A A302229 _R. H. Hardin_, Apr 03 2018