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 A303240 #4 Apr 20 2018 10:54:07 %S A303240 1,65,56,149,1373,7823,41878,277018,1721671,10607292,67278868, %T A303240 424616777,2676699369,16945268476,107280325551,679285054896, %U A303240 4304451618590,27282048865071,172940738855024,1096476824922147,6952546132868710 %N A303240 Number of nX6 0..1 arrays with every element equal to 0, 2, 3, 5 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero. %C A303240 Column 6 of A303242. %H A303240 R. H. Hardin, <a href="/A303240/b303240.txt">Table of n, a(n) for n = 1..210</a> %e A303240 Some solutions for n=5 %e A303240 ..0..0..1..1..1..0. .0..0..0..1..1..1. .0..1..1..0..0..0. .0..1..1..0..1..1 %e A303240 ..0..0..0..1..1..1. .1..0..0..0..1..1. .1..1..1..0..0..1. .1..1..1..1..1..0 %e A303240 ..1..0..1..1..1..1. .1..0..1..0..1..0. .1..1..1..0..0..0. .0..0..0..0..1..1 %e A303240 ..0..0..1..1..1..1. .1..0..0..0..1..1. .0..0..1..1..0..1. .1..0..0..1..1..0 %e A303240 ..0..0..0..1..1..0. .1..0..0..1..1..0. .0..0..1..1..0..1. .0..0..0..0..1..1 %Y A303240 Cf. A303242. %K A303240 nonn %O A303240 1,2 %A A303240 _R. H. Hardin_, Apr 20 2018