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 A285028 #6 Apr 05 2020 23:08:31 %S A285028 12,402,26226,1449814,85715676,5075612300,305391845288,18488589657334, %T A285028 1126075588671672,68870780949040304,4226950743201669212, %U A285028 260180180647806426762,16054794836399649515928,992844716266821792438782 %N A285028 Number of n X 6 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 A285028 Column 6 of A285030. %H A285028 R. H. Hardin, <a href="/A285028/b285028.txt">Table of n, a(n) for n = 1..53</a> %e A285028 Some solutions for n=3 %e A285028 ..0..1..1..1..0..1. .1..1..0..0..1..1. .1..1..0..0..0..1. .0..0..1..0..0..1 %e A285028 ..0..0..0..0..1..1. .0..0..0..1..0..1. .1..0..1..0..1..0. .0..1..0..0..0..1 %e A285028 ..0..0..1..0..1..1. .0..0..0..0..1..1. .0..1..1..0..0..1. .1..1..0..1..1..0 %Y A285028 Cf. A285030. %K A285028 nonn %O A285028 1,1 %A A285028 _R. H. Hardin_, Apr 08 2017