A224304 Number of n X n 0..2 arrays with diagonals and rows unimodal and antidiagonals nondecreasing.

3, 54, 1586, 45453, 1258372, 33934344, 911404794, 24751091876, 685844521863, 19455144713950, 564670981724616, 16727123708223072, 504154243224589510, 15415190705591603814

Offset: 1

Author

R. H. Hardin Apr 03 2013

Keywords

• nonn

Comments

Diagonal of A224310

Examples

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