A223771 Number of n X n 0..1 arrays with rows and columns unimodal and antidiagonals nondecreasing.

2, 12, 78, 461, 2516, 12975, 64256, 308895, 1451996, 6707709, 30563338, 137715999, 614855772, 2724027619

Offset: 1

Author

R. H. Hardin Mar 27 2013

Keywords

• nonn

Comments

Diagonal of A223777

Examples

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