A223614 Number of n X n 0..1 arrays with rows and columns unimodal.

2, 16, 240, 4466, 89630, 1856100, 39162020, 840122330, 18350758538, 409124396540, 9333564282142, 218396645933584, 5252293916506694

Offset: 1

Author

R. H. Hardin Mar 24 2013

Keywords

• nonn

Comments

Diagonal of A223620

Examples

			Some solutions for n=4
..1..1..0..0....0..1..0..0....0..0..0..0....1..0..0..0....0..1..1..0
..1..1..0..0....1..1..0..0....0..1..0..0....1..1..0..0....0..1..1..0
..1..1..0..0....0..1..0..0....0..1..1..0....1..1..1..1....0..1..1..0
..0..0..0..1....0..0..1..1....0..1..1..0....1..1..1..0....0..1..1..1