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 A285749 #6 Apr 05 2020 23:20:07 %S A285749 28,2042,250592,25450414,3020617824,341001631140,40895629554933, %T A285749 4828422171183992,584834466962677402,70587405158150794666, %U A285749 8620918536843418223386,1053438370876757943161204 %N A285749 Number of n X 7 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 A285749 Column 7 of A285750. %H A285749 R. H. Hardin, <a href="/A285749/b285749.txt">Table of n, a(n) for n = 1..25</a> %e A285749 Some solutions for n=2 %e A285749 ..1..0..0..0..1..0..1. .0..1..0..1..0..0..0. .1..1..1..0..1..0..0 %e A285749 ..1..0..1..0..0..1..0. .1..1..1..1..0..0..1. .0..1..0..0..1..0..0 %Y A285749 Cf. A285750. %K A285749 nonn %O A285749 1,1 %A A285749 _R. H. Hardin_, Apr 25 2017