A224127 Number of n X n 0..1 arrays with rows nondecreasing and antidiagonals unimodal.

2, 9, 58, 419, 3149, 24095, 186348, 1452236, 11385356, 89697284, 709549769, 5632222541, 44837998135, 357848802839, 2862135963926, 22934807116783, 184082328044394, 1479641153930348, 11908495546392890, 95951907989239148

Offset

1,1

Comments

Diagonal of A224133.

Links

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

Example

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

Crossrefs

Cf. A224133.

Sequence in context: A377964 A047852 A240881 * A366401 A116867 A168358

Adjacent sequences: A224124 A224125 A224126 * A224128 A224129 A224130

Keyword

nonn

Author

R. H. Hardin, Mar 31 2013

Status

approved