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 A285755 #6 Apr 05 2020 23:23:24 %S A285755 0,772,30918,1835412,101515318,5826888288,341001631140,20250991427072, %T A285755 1214918522385566,73448543128729780,4466607544580757916, %U A285755 272919461712510446696,16741533082231376611004,1030356006542260685630544 %N A285755 Number of 6 X n 0..1 arrays with the number of 1's horizontally, diagonally or antidiagonally adjacent to some 0 one less than the number of 0's adjacent to some 1. %C A285755 Row 6 of A285750. %H A285755 R. H. Hardin, <a href="/A285755/b285755.txt">Table of n, a(n) for n = 1..28</a> %e A285755 Some solutions for n=3 %e A285755 ..0..1..1. .1..1..0. .0..0..1. .1..1..0. .0..1..0. .0..1..1. .1..0..0 %e A285755 ..0..1..0. .1..1..1. .1..1..0. .1..1..0. .0..0..1. .1..1..1. .0..0..1 %e A285755 ..0..0..0. .0..0..0. .1..0..1. .1..1..1. .1..1..0. .0..0..0. .1..1..0 %e A285755 ..1..1..1. .1..0..0. .0..1..0. .0..1..0. .0..1..1. .0..1..0. .1..0..0 %e A285755 ..0..1..1. .0..1..1. .1..0..0. .1..0..0. .1..1..0. .0..1..0. .0..0..1 %e A285755 ..0..0..1. .1..0..0. .1..0..0. .1..0..0. .1..1..0. .1..0..1. .1..1..0 %Y A285755 Cf. A285750. %K A285755 nonn %O A285755 1,2 %A A285755 _R. H. Hardin_, Apr 25 2017