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A151639 Number of permutations of 3 indistinguishable copies of 1..n with exactly 9 adjacent element pairs in decreasing order. 0
0, 1, 1722320, 21475242671, 53885342499340, 59751188387945950 (list; graph; refs; listen; history; internal format)
OFFSET

3,3

CROSSREFS

Sequence in context: A083600 A172792 A121887 * A083646 A157858 A157862

Adjacent sequences:  A151636 A151637 A151638 * A151640 A151641 A151642

KEYWORD

nonn

AUTHOR

R. H. Hardin (rhhardin(AT)att.net) May 29 2009

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Last modified February 15 15:20 EST 2012. Contains 205823 sequences.