%I
%S 1,7,16,63,594,6388,88177,2078075,67448514,3011210310,200949643314,
%T 19152543505058,2587734793386622,506430044756068101,
%U 142259297693953559997,57178237320333047697665
%N Number of n X n binary arrays with each 1 adjacent to exactly one 0 vertically and one 0 horizontally
%C Diagonal of A183352
%H R. H. Hardin, <a href="/A183343/b183343.txt">Table of n, a(n) for n = 1..20</a>
%e Some solutions for 5X5
%e ..0..0..0..0..1....1..0..0..0..0....1..0..0..0..0....0..0..0..0..0
%e ..0..0..0..0..0....0..1..1..0..0....0..1..1..0..1....0..0..0..0..1
%e ..0..0..0..0..0....0..1..1..0..0....0..1..1..0..1....1..0..0..0..1
%e ..0..0..0..0..0....0..0..0..0..0....0..0..0..0..0....1..0..0..0..0
%e ..1..0..1..1..0....0..1..1..0..0....1..0..0..0..0....0..1..1..0..1
%K nonn
%O 1,2
%A _R. H. Hardin_ Jan 04 2011
