A207880 - OEIS

%I #6 Dec 18 2015 18:18:02

%S 2,16,82,575,4387,33631,618202,12501427,214612008,11062960730,

%T 657453772615,25402400315447,3733312830860298,643896610977129232,

%U 54640540348513184649,23181398334398528895458,11714931649831496203623180

%N Number of n X n 0..1 arrays avoiding 0 0 0 and 1 0 1 horizontally and 0 1 1 and 1 1 0 vertically

%C Diagonal of A207885

%e Some solutions for n=4

%e ..1..1..0..0....0..0..1..0....1..0..0..1....0..0..1..1....0..0..1..0

%e ..1..1..0..0....0..0..1..0....0..1..0..0....0..1..1..0....1..0..0..1

%e ..1..1..1..0....1..1..1..0....1..0..0..1....0..0..1..0....0..0..1..0

%e ..1..1..0..0....0..0..1..0....0..0..1..0....0..0..1..0....1..0..0..1

%K nonn

%O 1,1

%A _R. H. Hardin_ Feb 21 2012