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A151641 Number of permutations of 4 indistinguishable copies of 1..n with exactly 3 adjacent element pairs in decreasing order. 0
0, 16, 8464, 724320, 37229920, 1558185200, 59416090096 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..7.

CROSSREFS

Sequence in context: A280845 A069986 A265177 * A265240 A221137 A006448

Adjacent sequences:  A151638 A151639 A151640 * A151642 A151643 A151644

KEYWORD

nonn

AUTHOR

R. H. Hardin May 29 2009

STATUS

approved

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Last modified April 19 22:22 EDT 2019. Contains 322291 sequences. (Running on oeis4.)