A201694 Number of n X n 0..2 arrays with rows and columns lexicographically nondecreasing read forwards and nonincreasing read backwards.

3, 10, 116, 4998, 930564, 795339012, 3262897246338

Offset: 1

Author

R. H. Hardin Dec 03 2011

Keywords

• nonn

Comments

Diagonal of A201700

Examples

			Some solutions for n=3
..0..1..2....1..1..2....0..0..2....0..2..2....0..2..2....0..1..2....0..1..2
..0..2..0....1..2..1....0..2..0....0..2..2....1..0..2....2..0..2....2..1..1
..1..0..0....2..1..1....2..1..0....2..0..0....2..2..1....2..2..1....2..2..0