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 A298091 #4 Jan 12 2018 09:31:36 %S A298091 5,49,33,92,87,171,203,328,484,782,1106,1905,2833,4428,7210,11516, %T A298091 17938,28859,46630,73610,118590,191530,307255,494129,797251,1286394, %U A298091 2075589,3359029,5437187,8799802,14259390,23128238,37531667,60964288,99077978 %N A298091 Number of nX6 0..1 arrays with every element equal to 1, 2, 4 or 7 king-move adjacent elements, with upper left element zero. %C A298091 Column 6 of A298093. %H A298091 R. H. Hardin, <a href="/A298091/b298091.txt">Table of n, a(n) for n = 1..210</a> %e A298091 Some solutions for n=7 %e A298091 ..0..1..1..1..0..0. .0..1..0..1..0..1. .0..1..0..1..0..1. .0..1..0..1..0..1 %e A298091 ..0..1..0..1..0..1. .0..1..0..1..1..0. .1..0..1..0..1..0. .1..0..1..0..1..0 %e A298091 ..1..0..1..0..1..0. .1..0..0..0..0..1. .0..1..0..1..0..1. .0..1..0..1..0..1 %e A298091 ..1..0..0..0..1..1. .1..0..1..1..0..0. .1..0..1..0..1..0. .0..1..1..1..0..0 %e A298091 ..1..0..0..0..1..1. .1..0..0..0..1..1. .0..1..0..1..0..1. .0..1..1..1..0..0 %e A298091 ..1..0..1..0..1..0. .0..0..1..1..1..0. .1..0..1..0..1..0. .0..1..0..1..0..1 %e A298091 ..0..0..1..1..1..0. .1..1..0..0..1..0. .1..0..0..0..1..1. .1..0..1..0..1..0 %Y A298091 Cf. A298093. %K A298091 nonn %O A298091 1,1 %A A298091 _R. H. Hardin_, Jan 12 2018