A224044 Number of n X n 0..3 arrays with rows and columns unimodal and antidiagonals nondecreasing

4, 160, 9731, 638996, 41991129, 2701569493, 169750613182, 10454910167463, 634179969235617, 38050532050437859

Offset

1,1

Comments

Diagonal of A224050

Links

Table of n, a(n) for n=1..10.

Example

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

Crossrefs

Sequence in context: A268047 A278770 A264568 * A224275 A224198 A104133

Adjacent sequences: A224041 A224042 A224043 * A224045 A224046 A224047

Keyword

nonn

Author

R. H. Hardin Apr 01 2013

Status

approved