A224167 Number of n X n 0..3 arrays with rows and antidiagonals unimodal and columns nondecreasing

4, 100, 4739, 272130, 16625026, 1038484760, 65713691148, 4209750150062, 273303096405547

Offset

1,1

Comments

Diagonal of A224173

Links

Table of n, a(n) for n=1..9.

Example

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

Crossrefs

Sequence in context: A165518 A127776 A266524 * A223858 A223981 A224385

Adjacent sequences: A224164 A224165 A224166 * A224168 A224169 A224170

Keyword

nonn

Author

R. H. Hardin Mar 31 2013

Status

approved