A223926 Number of n X n 0..2 arrays with rows, columns and antidiagonals unimodal and diagonals nondecreasing.

3, 54, 1116, 21334, 386495, 6621074, 108796955, 1735753333, 27144561576

Offset: 1

Author

R. H. Hardin Mar 29 2013

Keywords

• nonn

Comments

Diagonal of A223933

Examples

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