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 A285146 #6 Apr 05 2020 23:09:45 %S A285146 0,2,12,56,236,950,3752,14684,57192,222308,863808,3357766,13061980, %T A285146 50859826,198235896,773453896,3020781528,11809145656,46207264696, %U A285146 180955506800,709219185000,2781727573396,10918267462160,42882371536718 %N A285146 Number of n X 2 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 A285146 Column 2 of A285152. %H A285146 R. H. Hardin, <a href="/A285146/b285146.txt">Table of n, a(n) for n = 1..210</a> %e A285146 Some solutions for n=4 %e A285146 ..0..0. .0..0. .0..1. .0..1. .0..1. .0..1. .1..0. .1..1. .1..1. .0..0 %e A285146 ..0..0. .1..0. .1..0. .0..0. .0..0. .0..1. .0..0. .0..0. .0..0. .1..0 %e A285146 ..0..1. .0..1. .0..0. .0..1. .1..1. .0..1. .1..0. .0..0. .1..0. .1..0 %e A285146 ..0..0. .1..0. .1..0. .1..0. .0..0. .0..0. .0..1. .1..0. .0..0. .1..0 %Y A285146 Cf. A285152. %K A285146 nonn %O A285146 1,2 %A A285146 _R. H. Hardin_, Apr 12 2017