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 A293093 #6 Apr 05 2020 23:44:38 %S A293093 0,1420,246743,30064393,3464680837,405651046593,48001754870966, %T A293093 5741377234777552,692287714517793203,84012955651693381631, %U A293093 10248181988944597335712,1255426108983775803770706 %N A293093 Number of 7 X n 0..1 arrays with the number of 1's horizontally or antidiagonally adjacent to some 0 two less than the number of 0's adjacent to some 1. %C A293093 Row 7 of A293087. %H A293093 R. H. Hardin, <a href="/A293093/b293093.txt">Table of n, a(n) for n = 1..24</a> %e A293093 Some solutions for n=2 %e A293093 ..0..1. .0..1. .0..0. .0..0. .1..1. .1..1. .1..0. .0..1. .0..0. .0..0 %e A293093 ..0..0. .0..0. .1..1. .0..1. .1..0. .1..0. .0..0. .0..0. .1..0. .0..0 %e A293093 ..0..1. .1..0. .1..0. .0..0. .0..0. .0..1. .1..0. .1..0. .0..0. .0..1 %e A293093 ..1..1. .0..1. .0..1. .1..0. .1..0. .0..0. .0..1. .0..1. .0..1. .0..0 %e A293093 ..0..0. .1..0. .0..0. .0..0. .1..0. .1..0. .0..1. .0..1. .0..0. .1..0 %e A293093 ..0..1. .1..0. .0..0. .1..1. .0..0. .0..0. .0..0. .1..0. .0..1. .0..0 %e A293093 ..0..0. .0..0. .1..0. .0..0. .1..0. .1..1. .1..1. .0..0. .1..0. .0..1 %Y A293093 Cf. A293087. %K A293093 nonn %O A293093 1,2 %A A293093 _R. H. Hardin_, Sep 30 2017