A201532 Number of n X n 0..2 arrays with rows and columns lexicographically nondecreasing and every element equal to at least one horizontal or vertical neighbor.

0, 9, 111, 7799, 2446147, 3762507339, 28456420346436

Offset: 1

Author

R. H. Hardin Dec 02 2011

Keywords

• nonn

Comments

Diagonal of A201539

Examples

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