A224140 Number of n X n 0..1 arrays with rows and antidiagonals unimodal and columns nondecreasing.

2, 9, 49, 272, 1509, 8375, 46586, 259927, 1454873, 8167578, 45975525, 259412481, 1466771294, 8308711329, 47142516717, 267868554552, 1524033271457, 8681096155047, 49500982033342, 282533898125471, 1614019099745197

Offset

1,1

Comments

Diagonal of A224146

Links

R. H. Hardin, Table of n, a(n) for n = 1..22

Example

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

Crossrefs

Sequence in context: A295944 A356632 A375798 * A360103 A382454 A390570

Adjacent sequences: A224137 A224138 A224139 * A224141 A224142 A224143

Keyword

nonn

Author

R. H. Hardin, Mar 31 2013

Status

approved