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A151657 Number of permutations of 7 indistinguishable copies of 1..n with exactly 3 adjacent element pairs in decreasing order. 0
0, 1225, 818300, 160310458, 22727054364, 2892619063243 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

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

CROSSREFS

Sequence in context: A250848 A014795 A267297 * A218273 A046177 A031748

Adjacent sequences:  A151654 A151655 A151656 * A151658 A151659 A151660

KEYWORD

nonn

AUTHOR

R. H. Hardin May 29 2009

STATUS

approved

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Last modified August 15 09:12 EDT 2018. Contains 313756 sequences. (Running on oeis4.)