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 A299450 #4 Feb 10 2018 10:30:05 %S A299450 21,64,11,161,546,804,6326,19745,39495,290364,855008,2191987,14241405, %T A299450 41451856,129702347,739374632,2206681686,7939800765,40476006538, %U A299450 126433675843,496773451920,2321391370041,7652725646418,31537376314083 %N A299450 Number of nX7 0..1 arrays with every element equal to 0, 1, 3, 5, 6 or 8 king-move adjacent elements, with upper left element zero. %C A299450 Column 7 of A299451. %H A299450 R. H. Hardin, <a href="/A299450/b299450.txt">Table of n, a(n) for n = 1..177</a> %e A299450 Some solutions for n=5 %e A299450 ..0..0..1..0..1..0..1. .0..1..1..1..0..1..0. .0..1..0..1..0..1..0 %e A299450 ..1..1..1..1..1..1..0. .0..1..1..1..0..1..0. .1..0..0..0..0..0..1 %e A299450 ..1..1..1..0..0..0..0. .1..1..1..1..0..0..0. .0..0..0..1..1..1..1 %e A299450 ..0..0..1..0..0..0..1. .0..1..1..1..0..1..0. .1..0..0..1..1..1..0 %e A299450 ..0..0..1..0..0..0..1. .0..1..1..1..0..1..0. .1..0..0..1..1..1..0 %Y A299450 Cf. A299451. %K A299450 nonn %O A299450 1,1 %A A299450 _R. H. Hardin_, Feb 10 2018