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A151651 Number of permutations of 6 indistinguishable copies of 1..n with exactly 2 adjacent element pairs in decreasing order. 0
0, 225, 15606, 554931, 16689816, 477537957 (list; graph; refs; listen; history; internal format)
OFFSET

1,2

CROSSREFS

Sequence in context: A167042 A164763 A164752 * A051364 A192934 A061051

Adjacent sequences:  A151648 A151649 A151650 * A151652 A151653 A151654

KEYWORD

nonn

AUTHOR

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

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Last modified February 14 05:09 EST 2012. Contains 205570 sequences.