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A180837 Number of nX3 arrays containing 3 indistinguishable copies of 1..n with rows and columns in lexicographically strictly increasing order 0
1, 1, 77, 5385, 545426, 79230924, 15755497776, 4122239926855 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

Column 3 of A180839

LINKS

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

EXAMPLE

Some solutions for 3X3

..1..1..2....1..1..2....1..1..2....1..1..2....1..1..2....1..1..2....1..1..2

..1..2..3....1..2..2....1..2..3....1..2..3....1..3..2....1..3..3....1..3..3

..2..3..3....3..3..3....3..3..2....3..2..3....2..3..3....2..3..2....2..2..3

...

..1..1..2....1..1..2....1..1..2....1..1..3....1..1..3....1..1..3....1..1..3

..1..3..2....1..3..2....1..3..3....1..2..2....1..2..3....1..2..3....1..2..2

..3..3..2....3..2..3....3..2..2....2..3..3....2..3..2....2..2..3....3..3..2

...

..1..1..3....1..1..3....1..1..3....1..1..3....1..1..3....1..1..3....1..1..1

..1..2..2....1..2..3....1..3..2....1..3..2....1..3..3....1..3..2....2..2..3

..3..2..3....3..2..2....2..3..2....2..2..3....2..2..2....3..2..2....2..3..3

...

..1..1..2....1..1..2....1..1..2....1..1..2....1..1..2....1..1..2....1..1..2

..2..3..1....2..3..1....2..3..1....2..3..2....2..3..2....2..3..3....2..3..3

..2..3..3....3..3..2....3..2..3....3..3..1....3..1..3....3..1..2....3..2..1

CROSSREFS

Sequence in context: A217455 A116319 A217962 * A210811 A107787 A099638

Adjacent sequences:  A180834 A180835 A180836 * A180838 A180839 A180840

KEYWORD

nonn

AUTHOR

R. H. Hardin Sep 20 2010

STATUS

approved

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Last modified July 4 20:08 EDT 2022. Contains 355086 sequences. (Running on oeis4.)