A224051 Number of n X n 0..2 arrays with rows and columns unimodal and antidiagonals nondecreasing.

3, 54, 1232, 27246, 568107, 11231300, 212819499, 3903149379, 69818587635, 1225169731998

Offset: 1

Author

R. H. Hardin Mar 30 2013

Keywords

• nonn

Comments

Diagonal of A224057

Examples

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