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 A285753 #6 Apr 05 2020 23:22:18 %S A285753 0,52,550,8544,119506,1729212,25450414,379892924,5724356600, %T A285753 86870686676,1325147534394,20298649626624,312012262489322, %U A285753 4809932665481580,74334215199171600,1151283153187656576,17865166558629037394 %N A285753 Number of 4 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 A285753 Row 4 of A285750. %H A285753 R. H. Hardin, <a href="/A285753/b285753.txt">Table of n, a(n) for n = 1..130</a> %e A285753 Some solutions for n=4 %e A285753 ..0..0..1..1. .1..0..0..1. .1..1..0..0. .0..0..0..0. .1..1..0..0 %e A285753 ..0..0..1..1. .0..1..1..0. .0..1..0..0. .1..0..0..1. .1..0..1..1 %e A285753 ..1..0..0..0. .1..0..0..1. .0..1..0..0. .1..1..0..0. .0..1..0..0 %e A285753 ..0..1..0..1. .0..0..0..1. .1..1..0..1. .1..1..1..0. .0..1..0..0 %Y A285753 Cf. A285750. %K A285753 nonn %O A285753 1,2 %A A285753 _R. H. Hardin_, Apr 25 2017