|
%I #7 Dec 18 2015 18:17:56
%S 1,12,398,45519,21649928,41382940317,314293683119573,
%T 9507225584601580673,1146261969825089219425266,
%U 550762886957237938187269588944,1054576957682838130471744629459577753
%N Number of n X n binary arrays with every one adjacent to another one horizontally, diagonally, antidiagonally or vertically
%C Diagonal of A202795
%H R. H. Hardin, <a href="/A202788/b202788.txt">Table of n, a(n) for n = 1..15</a>
%e Some solutions for n=4
%e ..1..1..1..1....0..0..1..1....0..1..1..0....0..1..1..1....0..1..0..0
%e ..0..0..1..1....0..1..0..1....1..0..1..0....0..0..0..1....0..1..1..1
%e ..0..1..1..1....0..0..0..0....1..1..1..0....1..0..0..1....1..1..0..1
%e ..1..0..0..0....1..1..0..0....1..1..1..1....1..1..1..1....1..0..1..0
%K nonn
%O 1,2
%A _R. H. Hardin_ Dec 24 2011
| 