A207983 Number of n X n 0..2 arrays avoiding the pattern z z+1 z horizontally and z z-1 z vertically.

3, 81, 12468, 12271227, 81269646503, 3578849222737632, 1043523305166893694120, 2015556742069061275212434339

Offset: 1

Author

R. H. Hardin Feb 22 2012

Keywords

• nonn

Comments

Diagonal of A207989

Examples

			Some solutions for n=4
..1..1..1..0....0..2..0..0....2..1..2..2....0..2..0..2....0..2..0..1
..1..2..2..2....0..1..2..0....2..2..1..2....2..2..0..2....2..0..1..1
..0..1..2..2....1..0..2..0....0..2..0..2....2..0..1..2....0..2..1..1
..2..0..0..1....0..2..1..2....0..0..2..1....0..2..1..0....2..0..0..1