A224347 Number of n X n 0..2 arrays with diagonals and antidiagonals unimodal and rows nondecreasing

3, 36, 788, 19608, 495985, 12340932, 300892325, 7202270426, 169987960308, 3972599259664, 92292550974356

Offset

1,1

Comments

Diagonal of A224353

Links

Table of n, a(n) for n=1..11.

Example

Some solutions for n=3
..0..1..1....0..0..1....1..2..2....0..0..0....1..2..2....0..0..0....0..0..1
..1..1..2....1..1..2....0..1..2....0..0..2....0..2..2....0..1..2....2..2..2
..2..2..2....0..1..1....1..1..1....0..2..2....0..0..1....0..0..0....0..2..2

Crossrefs

Sequence in context: A301582 A122220 A186730 * A377548 A227251 A326273

Adjacent sequences: A224344 A224345 A224346 * A224348 A224349 A224350

Keyword

nonn

Author

R. H. Hardin Apr 04 2013

Status

approved