A223717 Number of n X n 0..2 arrays with rows, antidiagonals and columns unimodal

3, 81, 5883, 608855, 74140718, 9991366555, 1461411174370, 229731305080429, 38440119395606004

Offset

1,1

Comments

Diagonal of A223725

Links

Table of n, a(n) for n=1..9.

Example

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

Crossrefs

Sequence in context: A223736 A355157 A207229 * A223825 A207222 A207007

Adjacent sequences: A223714 A223715 A223716 * A223718 A223719 A223720

Keyword

nonn

Author

R. H. Hardin Mar 26 2013

Status

approved