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 A285027 #6 Apr 05 2020 23:07:31 %S A285027 6,104,4892,96458,3708321,85715676,3064900470,78636441270, %T A285027 2682905798545,73600360297334,2433998194373248,69767776892869600, %U A285027 2261219156494126134,66739124011458434960,2135780550666327650338,64294985432981238003878 %N A285027 Number of n X 5 0..1 arrays with the number of 1's horizontally, antidiagonally or vertically adjacent to some 0 one less than the number of 0's adjacent to some 1. %C A285027 Column 5 of A285030. %H A285027 R. H. Hardin, <a href="/A285027/b285027.txt">Table of n, a(n) for n = 1..98</a> %e A285027 Some solutions for n=4 %e A285027 ..1..1..0..1..0. .0..1..0..0..1. .0..1..1..0..1. .1..0..1..1..0 %e A285027 ..0..1..0..0..0. .1..1..0..1..0. .1..0..1..0..1. .1..0..0..0..0 %e A285027 ..0..1..1..0..0. .0..0..1..1..0. .1..1..0..0..0. .0..0..1..1..1 %e A285027 ..0..1..0..1..1. .0..0..1..1..0. .0..0..0..0..1. .1..0..0..1..1 %Y A285027 Cf. A285030. %K A285027 nonn %O A285027 1,1 %A A285027 _R. H. Hardin_, Apr 08 2017