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

1,1

Comments

Diagonal of A223918.

Links

Table of n, a(n) for n=1..15.

Example

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.

Sequence in context: A203493 A296098 A224256 * A224184 A241996 A366004

Adjacent sequences: A223909 A223910 A223911 * A223913 A223914 A223915

Keyword

nonn

Author

R. H. Hardin Mar 29 2013

Status

approved