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A180838 Number of nX4 arrays containing 4 indistinguishable copies of 1..n with rows and columns in lexicographically strictly increasing order 0
1, 1, 472, 300888, 333191079, 637698093267 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

Column 4 of A180839

LINKS

Table of n, a(n) for n=1..6.

EXAMPLE

Some solutions for 3X4

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

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

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

...

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

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

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

...

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

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

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

CROSSREFS

Sequence in context: A259640 A187161 A249534 * A006180 A074654 A157434

Adjacent sequences:  A180835 A180836 A180837 * A180839 A180840 A180841

KEYWORD

nonn

AUTHOR

R. H. Hardin Sep 20 2010

STATUS

approved

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Last modified June 25 12:55 EDT 2022. Contains 354851 sequences. (Running on oeis4.)