%I #5 Dec 18 2015 18:18:52
%S 1,2,9,91,2456,184819,37066859,18940533171,24272278810439,
%T 77660940030730106
%N Number of n X n 0..1 arrays with no element equal to exactly one horizontal or vertical neighbor, with new values 0..1 introduced in row major order
%C Diagonal of A240656
%e Some solutions for n=4
%e ..0..0..0..0....0..0..0..1....0..0..1..1....0..1..0..0....0..0..0..1
%e ..0..1..0..0....0..0..0..0....0..0..1..1....1..0..0..0....0..0..0..0
%e ..0..0..1..0....0..1..0..0....0..0..0..0....0..0..1..0....0..0..0..0
%e ..1..0..0..0....0..0..0..0....0..0..0..0....0..0..0..0....1..0..0..0
%K nonn
%O 1,2
%A _R. H. Hardin_, Apr 09 2014
|