A223763 Number of n X n 0..1 arrays with rows, columns and antidiagonals unimodal and diagonals nondecreasing

2, 12, 71, 361, 1748, 8007, 35513, 153450, 651075, 2723829, 11275932, 46302339, 188958191, 767474182, 3105857015

Offset

1,1

Comments

Diagonal of A223770

Links

Table of n, a(n) for n=1..15.

Example

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

Crossrefs

Sequence in context: A012421 A012381 A012376 * A361960 A002630 A009552

Adjacent sequences: A223760 A223761 A223762 * A223764 A223765 A223766

Keyword

nonn

Author

R. H. Hardin Mar 27 2013

Status

approved