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 A304009 #4 May 04 2018 11:22:01 %S A304009 1,99,99,211,655,1458,4224,10633,28365,75175,201031,544217,1452266, %T A304009 3908208,10505646,28266755,76097248,204983456,552420015,1488384837, %U A304009 4011805443,10816167549,29162780211,78639733211,212076547630 %N A304009 Number of nX7 0..1 arrays with every element unequal to 0, 2, 3 or 5 king-move adjacent elements, with upper left element zero. %C A304009 Column 7 of A304010. %H A304009 R. H. Hardin, <a href="/A304009/b304009.txt">Table of n, a(n) for n = 1..210</a> %e A304009 Some solutions for n=5 %e A304009 ..0..0..0..0..1..1..1. .0..0..0..0..0..0..1. .0..1..1..0..1..1..0 %e A304009 ..1..1..1..0..1..1..1. .1..1..0..1..1..1..0. .0..1..0..0..0..1..0 %e A304009 ..0..1..0..1..1..1..1. .0..1..1..1..0..0..1. .1..0..0..0..0..0..1 %e A304009 ..0..0..0..1..1..0..0. .1..1..1..0..1..0..1. .0..1..0..0..0..1..0 %e A304009 ..1..0..1..1..0..0..1. .0..1..0..0..1..1..0. .1..0..1..1..1..0..1 %Y A304009 Cf. A304010. %K A304009 nonn %O A304009 1,2 %A A304009 _R. H. Hardin_, May 04 2018