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 A298084 #4 Jan 12 2018 09:00:28 %S A298084 0,11,1,28,154,520,1574,7204,28790,105055,437163,1792603,6981116, %T A298084 28580319,115795593,464405679,1883192839,7625910371,30781567549, %U A298084 124586304213,504301473498,2038932788749,8250005089404,33384996732923 %N A298084 Number of nX5 0..1 arrays with every element equal to 2, 3, 5 or 6 king-move adjacent elements, with upper left element zero. %C A298084 Column 5 of A298087. %H A298084 R. H. Hardin, <a href="/A298084/b298084.txt">Table of n, a(n) for n = 1..210</a> %e A298084 Some solutions for n=7 %e A298084 ..0..0..1..0..0. .0..0..1..0..0. .0..0..0..0..0. .0..0..0..1..1 %e A298084 ..0..0..1..1..0. .0..1..0..1..0. .0..0..0..0..0. .0..1..1..0..1 %e A298084 ..1..1..1..1..1. .1..0..0..0..1. .1..1..0..1..1. .0..1..0..0..1 %e A298084 ..1..0..1..0..1. .1..0..0..0..1. .1..0..0..1..0. .0..0..1..1..1 %e A298084 ..0..0..0..0..1. .0..1..0..1..0. .0..0..0..0..0. .1..1..1..1..0 %e A298084 ..0..1..0..1..1. .1..0..0..1..0. .1..0..0..1..1. .0..1..1..0..0 %e A298084 ..1..1..0..0..1. .1..1..1..0..0. .1..1..0..1..1. .0..0..1..1..0 %Y A298084 Cf. A298087. %K A298084 nonn %O A298084 1,2 %A A298084 _R. H. Hardin_, Jan 12 2018