A223763 Number of n X n 0..1 arrays with rows, columns and antidiagonals unimodal and diagonals nondecreasing.

2, 12, 71, 361, 1748, 8007, 35513, 153450, 651075, 2723829, 11275932, 46302339, 188958191, 767474182, 3105857015

Offset: 1

Author

R. H. Hardin Mar 27 2013

Keywords

• nonn

Comments

Diagonal of A223770

Examples

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