A206856 Number of n X n 0..2 arrays avoiding the pattern z z+1 z in any row, column, diagonal or antidiagonal.

3, 81, 11092, 7598355, 31208037240, 729358354663001, 92792498733436652359

Offset: 1

Author

R. H. Hardin Feb 13 2012

Keywords

• nonn

Comments

Diagonal of A206863

Examples

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