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 A284453 #6 Apr 05 2020 23:00:43 %S A284453 12,0,16478,824052,52793160,3177012844,197373621124,12262301470824, %T A284453 765844185617960,47948372703291720,3007592277730507060, %U A284453 188906442508764876656,11876939646231731080510,747292579695048713129724 %N A284453 Number of n X 6 0..1 arrays with the number of 1's king-move adjacent to some 0 one less than the number of 0's adjacent to some 1. %C A284453 Column 6 of A284455. %H A284453 R. H. Hardin, <a href="/A284453/b284453.txt">Table of n, a(n) for n = 1..48</a> %e A284453 Some solutions for n=3 %e A284453 ..1..1..1..0..0..0. .1..1..1..0..0..1. .1..0..1..0..1..0. .1..0..1..0..0..0 %e A284453 ..1..1..0..1..1..0. .1..1..0..0..0..0. .0..0..1..1..0..0. .1..1..1..1..0..0 %e A284453 ..1..0..0..0..0..1. .1..0..0..1..0..1. .1..1..0..1..0..0. .1..0..0..0..0..1 %Y A284453 Cf. A284455. %K A284453 nonn %O A284453 1,1 %A A284453 _R. H. Hardin_, Mar 27 2017