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 A300176 #8 Apr 19 2020 23:58:04 %S A300176 1,8,255,32321,16288960,32640586945,260070240849459, %T A300176 8239275981240122104,1037894641315598870418625, %U A300176 519856344665932729699372254283,1035331146709687346593709910443435692 %N A300176 Number of n X n 0..1 arrays with every element equal to 0, 1, 2, 3, 4, 5, 6 or 7 king-move adjacent elements, with upper left element zero. %C A300176 Diagonal of A300182. %H A300176 R. H. Hardin, <a href="/A300176/b300176.txt">Table of n, a(n) for n = 1..13</a> %e A300176 Some solutions for n=5 %e A300176 ..0..0..0..0..0. .0..0..0..0..0. .0..0..0..0..0. .0..0..0..0..0 %e A300176 ..0..0..0..0..1. .0..0..0..0..1. .0..0..0..1..0. .0..0..0..0..0 %e A300176 ..1..1..1..0..1. .1..0..1..1..1. .1..1..0..1..0. .0..1..0..1..1 %e A300176 ..0..0..0..1..0. .0..0..0..1..1. .1..1..1..1..1. .1..0..0..1..0 %e A300176 ..1..1..0..1..0. .0..0..0..0..0. .1..1..1..1..0. .0..0..1..0..0 %Y A300176 Cf. A300182. %K A300176 nonn %O A300176 1,2 %A A300176 _R. H. Hardin_, Feb 27 2018