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A151641 Number of permutations of 4 indistinguishable copies of 1..n with exactly 3 adjacent element pairs in decreasing order. 0
0, 16, 8464, 724320, 37229920, 1558185200, 59416090096 (list; graph; refs; listen; history; internal format)
OFFSET

1,2

CROSSREFS

Sequence in context: A079920 A203390 A069986 * A006448 A017092 A191945

Adjacent sequences:  A151638 A151639 A151640 * A151642 A151643 A151644

KEYWORD

nonn

AUTHOR

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

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Last modified February 15 19:15 EST 2012. Contains 205852 sequences.