A223844 Number of n X n 0..3 arrays with rows and columns unimodal

4, 256, 64660, 32464394, 24291817048, 23571122875874, 27578655986218632, 37359132548315097216

Offset

1,1

Comments

Diagonal of A223850

Links

Table of n, a(n) for n=1..8.

Example

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

Crossrefs

Sequence in context: A085534 A071617 A223755 * A122249 A326556 A223795

Adjacent sequences: A223841 A223842 A223843 * A223845 A223846 A223847

Keyword

nonn

Author

R. H. Hardin Mar 27 2013

Status

approved