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 A285024 #6 Apr 05 2020 23:05:28 %S A285024 0,2,6,26,104,402,1578,6196,24310,95446,374872,1472938,5790024, %T A285024 22768624,89562540,352395768,1386874908,5459330780,21494802570, %U A285024 84648191106,333419873528,1313575442496,5176174458602,20401118165166,80425006887898 %N A285024 Number of n X 2 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 A285024 Column 2 of A285030. %H A285024 R. H. Hardin, <a href="/A285024/b285024.txt">Table of n, a(n) for n = 1..210</a> %e A285024 Some solutions for n=4 %e A285024 ..0..0. .1..1. .0..0. .1..0. .0..0. .1..1. .0..0. .1..1. .0..0. .0..1 %e A285024 ..1..1. .0..0. .0..1. .0..1. .0..1. .1..0. .0..0. .1..0. .0..0. .0..0 %e A285024 ..1..0. .1..0. .0..0. .1..0. .0..1. .0..1. .0..1. .0..0. .0..1. .0..1 %e A285024 ..0..0. .0..0. .1..1. .0..0. .0..1. .0..0. .1..0. .0..1. .0..1. .1..1 %Y A285024 Cf. A285030. %K A285024 nonn %O A285024 1,2 %A A285024 _R. H. Hardin_, Apr 08 2017