A224152 Number of n X n 0..1 arrays with diagonals and rows unimodal and antidiagonals nondecreasing.

2, 12, 89, 574, 3469, 20065, 114537, 650819, 3705824, 21181267, 121617211, 701255335, 4058735341, 23565789117, 137190976378, 800437914689, 4678794395883, 27391873966579, 160581355210547, 942493889605853

Offset

1,1

Comments

Diagonal of A224158.

Links

R. H. Hardin, Table of n, a(n) for n = 1..23

Example

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

Crossrefs

Cf. A224158.

Sequence in context: A372090 A143923 A079858 * A174356 A355138 A121357

Adjacent sequences: A224149 A224150 A224151 * A224153 A224154 A224155

Keyword

nonn

Author

R. H. Hardin, Mar 31 2013

Status

approved