A223771 Number of n X n 0..1 arrays with rows and columns unimodal and antidiagonals nondecreasing

2, 12, 78, 461, 2516, 12975, 64256, 308895, 1451996, 6707709, 30563338, 137715999, 614855772, 2724027619

Offset

1,1

Comments

Diagonal of A223777

Links

Table of n, a(n) for n=1..14.

Example

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

Crossrefs

Sequence in context: A372410 A372233 A081014 * A370442 A062871 A306272

Adjacent sequences: A223768 A223769 A223770 * A223772 A223773 A223774

Keyword

nonn

Author

R. H. Hardin Mar 27 2013

Status

approved