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A151639 Number of permutations of 3 indistinguishable copies of 1..n with exactly 9 adjacent element pairs in decreasing order. 0
0, 1, 1722320, 21475242671, 53885342499340, 59751188387945950 (list; graph; refs; listen; history; text; internal format)
OFFSET

3,3

LINKS

Table of n, a(n) for n=3..8.

CROSSREFS

Sequence in context: A307962 A257382 A233633 * A083646 A157858 A157862

Adjacent sequences:  A151636 A151637 A151638 * A151640 A151641 A151642

KEYWORD

nonn

AUTHOR

R. H. Hardin May 29 2009

STATUS

approved

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Last modified December 10 00:54 EST 2019. Contains 329885 sequences. (Running on oeis4.)