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 A285026 #6 Apr 05 2020 23:06:54 %S A285026 2,26,442,6460,96458,1449814,22043878,336883696,5171750894, %T A285026 79634735346,1229304353554,19015329654036,294656614022300, %U A285026 4573021347213134,71071712948803680,1105968089007186270,17230453143587374712 %N A285026 Number of n X 4 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 A285026 Column 4 of A285030. %H A285026 R. H. Hardin, <a href="/A285026/b285026.txt">Table of n, a(n) for n = 1..207</a> %e A285026 Some solutions for n=4 %e A285026 ..0..0..0..1. .0..0..1..1. .0..0..1..0. .1..1..0..0. .1..1..1..0 %e A285026 ..0..0..1..1. .1..1..0..1. .1..1..0..1. .0..1..0..0. .0..0..1..1 %e A285026 ..0..0..1..0. .1..0..0..0. .0..1..1..0. .0..0..1..0. .0..0..0..0 %e A285026 ..0..1..0..0. .0..0..0..0. .0..1..0..0. .1..1..0..1. .0..0..0..0 %Y A285026 Cf. A285030. %K A285026 nonn %O A285026 1,1 %A A285026 _R. H. Hardin_, Apr 08 2017