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 A284452 #6 Apr 05 2020 23:00:07 %S A284452 6,0,5253,54248,4190874,52793160,3478866516,51105257464,3013637890236, %T A284452 50103215952170,2690074942950538,49496986589768228, %U A284452 2453145792485211975,49093699484421451316,2273291621866265836761,48802745578218591419362 %N A284452 Number of n X 5 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 A284452 Column 5 of A284455. %H A284452 R. H. Hardin, <a href="/A284452/b284452.txt">Table of n, a(n) for n = 1..89</a> %e A284452 Some solutions for n=4 %e A284452 ..0..0..1..1..0. .0..0..1..1..0. .0..1..0..1..1. .1..1..1..0..0 %e A284452 ..0..1..0..0..1. .0..0..0..1..1. .0..0..0..0..0. .0..0..0..0..0 %e A284452 ..0..1..1..0..0. .1..1..0..0..1. .1..1..0..1..1. .0..1..0..1..1 %e A284452 ..1..1..1..0..0. .0..0..1..0..1. .0..0..1..1..1. .1..0..1..1..0 %Y A284452 Cf. A284455. %K A284452 nonn %O A284452 1,1 %A A284452 _R. H. Hardin_, Mar 27 2017