A223993 Number of n X n 0..2 arrays with antidiagonals unimodal and rows and diagonals nondecreasing.

3, 31, 476, 7927, 132119, 2160036, 34534687, 540957770, 8329684774, 126518474741, 1901584578700, 28359907789963, 420651674953990, 6217185029060841, 91703594406693983

Offset: 1

Author

R. H. Hardin Mar 30 2013

Keywords

• nonn

Comments

Diagonal of A223999

Examples

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