A223912 Number of n X n 0..2 arrays with rows and antidiagonals unimodal and columns nondecreasing.

3, 36, 666, 14123, 319156, 7526024, 183720802, 4620831232, 119279565646, 3149193338709, 84781194626719, 2321280055370071, 64493788929080253, 1814933493902398900, 51651065174273533812

Offset: 1

Author

R. H. Hardin Mar 29 2013

Keywords

• nonn

Comments

Diagonal of A223918.

Examples

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

Crossrefs

Cf. A223918.