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A224125 Number of 3Xn 0..3 arrays with row sums nondecreasing and column sums unimodal 1
20, 1080, 47059, 1703178, 53355889, 1491827492, 38051383139, 899713542225, 19963535397227, 419672473818646, 8421847090410941, 162325525523034609, 3020162740527368685, 54468878788851494328, 955569173872191005683 (list; graph; refs; listen; history; text; internal format)
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

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Last modified July 4 16:26 EDT 2022. Contains 355081 sequences. (Running on oeis4.)