A224125 Number of 3Xn 0..3 arrays with row sums nondecreasing and column sums unimodal

20, 1080, 47059, 1703178, 53355889, 1491827492, 38051383139, 899713542225, 19963535397227, 419672473818646, 8421847090410941, 162325525523034609, 3020162740527368685, 54468878788851494328, 955569173872191005683

Offset

1,1

Comments

Row 3 of A224123

Links

R. H. Hardin, Table of n, a(n) for n = 1..21

Example

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

Crossrefs

Sequence in context: A138915 A006427 A072962 * A324416 A177596 A210835

Adjacent sequences: A224122 A224123 A224124 * A224126 A224127 A224128

Keyword

nonn

Author

R. H. Hardin Mar 31 2013

Status

approved