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 A285025 #6 Apr 05 2020 23:06:09 %S A285025 1,6,97,442,4892,26226,256732,1544872,14082710,91677088,797188437, %T A285025 5483647480,46175013577,330178554834,2719685483708,19987724476418, %U A285025 162187667549290,1215451639260848,9763451129789048,74199887341866168 %N A285025 Number of n X 3 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 A285025 Column 3 of A285030. %H A285025 R. H. Hardin, <a href="/A285025/b285025.txt">Table of n, a(n) for n = 1..210</a> %e A285025 Some solutions for n=4 %e A285025 ..0..0..1. .1..1..1. .0..1..1. .1..1..1. .1..0..0. .0..0..1. .0..1..1 %e A285025 ..0..1..0. .1..1..0. .0..0..0. .0..0..1. .1..1..1. .0..1..1. .0..1..0 %e A285025 ..1..0..1. .0..1..0. .1..1..0. .0..0..0. .0..0..0. .0..0..1. .0..0..1 %e A285025 ..0..0..1. .0..0..0. .1..0..0. .0..1..0. .0..0..0. .1..0..0. .0..0..1 %Y A285025 Cf. A285030. %K A285025 nonn %O A285025 1,2 %A A285025 _R. H. Hardin_, Apr 08 2017