A223631 Number of n X n 0..1 arrays with rows, antidiagonals and columns unimodal

2, 16, 229, 3712, 61545, 1026377, 17224974, 291563806, 4984273228, 86086143903, 1502219415538

Offset

1,1

Comments

Diagonal of A223637

Links

Table of n, a(n) for n=1..11.

Example

Some solutions for n=4
..1..0..0..0....0..1..0..0....0..0..0..0....0..0..1..0....1..1..1..0
..1..1..1..1....0..0..0..0....1..1..0..0....1..1..1..1....1..1..1..1
..1..1..1..1....0..0..0..1....1..1..1..1....0..0..1..1....1..1..1..1
..0..0..0..1....0..0..0..1....0..0..1..1....0..0..0..1....1..1..1..0

Crossrefs

Sequence in context: A187657 A047657 A233141 * A188500 A188515 A152542

Adjacent sequences: A223628 A223629 A223630 * A223632 A223633 A223634

Keyword

nonn

Author

R. H. Hardin Mar 24 2013

Status

approved