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 A285746 #6 Apr 05 2020 23:17:57 %S A285746 2,44,630,8544,125088,1835412,27339964,410644956,6209001966, %T A285746 94379911740,1441030936810,22084845714940,339564086313454, %U A285746 5235658587223164,80926601563138862,1253589943179659024,19456171723796564164 %N A285746 Number of n X 4 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 A285746 Column 4 of A285750. %H A285746 R. H. Hardin, <a href="/A285746/b285746.txt">Table of n, a(n) for n = 1..164</a> %e A285746 Some solutions for n=4 %e A285746 ..0..1..1..0. .0..1..0..1. .0..1..0..0. .1..1..1..0. .1..0..1..0 %e A285746 ..0..0..1..0. .1..1..0..1. .0..1..1..0. .0..0..1..0. .0..0..1..0 %e A285746 ..1..0..1..0. .0..0..0..0. .1..0..0..1. .0..1..0..0. .0..0..0..1 %e A285746 ..0..1..1..1. .1..0..0..1. .1..1..0..0. .1..1..1..0. .0..1..1..1 %Y A285746 Cf. A285750. %K A285746 nonn %O A285746 1,1 %A A285746 _R. H. Hardin_, Apr 25 2017