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A151649 Number of permutations of 5 indistinguishable copies of 1..n with exactly 4 adjacent element pairs in decreasing order. 0
0, 25, 182700, 84646275, 18746073375, 3085105337250 (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: A013835 A211600 A068737 * A122500 A251362 A196520

Adjacent sequences:  A151646 A151647 A151648 * A151650 A151651 A151652

KEYWORD

nonn

AUTHOR

R. H. Hardin May 29 2009

STATUS

approved

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Last modified February 24 04:36 EST 2020. Contains 332197 sequences. (Running on oeis4.)