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 A285148 #6 Apr 05 2020 23:11:02 %S A285148 2,58,820,11574,166624,2446130,36367674,545774302,8250020936, %T A285148 125432428398,1916089561276,29385041758324,452142438975318, %U A285148 6976767708453156,107918789132352190,1672896226875572812 %N A285148 Number of n X 4 0..1 arrays with the number of 1's horizontally or antidiagonally adjacent to some 0 one less than the number of 0's adjacent to some 1. %C A285148 Column 4 of A285152. %H A285148 R. H. Hardin, <a href="/A285148/b285148.txt">Table of n, a(n) for n = 1..210</a> %e A285148 Some solutions for n=4 %e A285148 ..0..1..0..1. .0..1..0..0. .1..1..1..1. .1..0..0..0. .1..1..1..0 %e A285148 ..0..0..1..1. .0..0..0..1. .0..0..1..0. .0..1..0..1. .0..0..1..0 %e A285148 ..0..1..0..0. .1..1..1..1. .0..0..0..1. .0..1..1..0. .0..0..1..1 %e A285148 ..1..0..0..1. .0..0..0..1. .0..1..0..1. .0..1..1..0. .0..1..1..0 %Y A285148 Cf. A285152. %K A285148 nonn %O A285148 1,1 %A A285148 _R. H. Hardin_, Apr 12 2017