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A151632 Number of permutations of 3 indistinguishable copies of 1..n with exactly 2 adjacent element pairs in decreasing order. 0
0, 9, 405, 6750, 83736, 922347, 9639783, 98361900, 992660346 (list; graph; refs; listen; history; internal format)
OFFSET

1,2

CROSSREFS

Sequence in context: A063876 A063156 A058850 * A035024 A179433 A091061

Adjacent sequences:  A151629 A151630 A151631 * A151633 A151634 A151635

KEYWORD

nonn

AUTHOR

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

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Last modified February 17 05:54 EST 2012. Contains 205985 sequences.