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A152499 1/12 of the number of permutations of 3 indistinguishable copies of 1..n with exactly 2 local maxima. 0
0, 1, 30, 664, 13632, 274432, 5497344, 109987840, 2199945216 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

LINKS

Table of n, a(n) for n=1..9.

CROSSREFS

Sequence in context: A111779 A075473 A051563 * A027475 A180801 A035520

Adjacent sequences:  A152496 A152497 A152498 * A152500 A152501 A152502

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 06 2008

STATUS

approved

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Last modified February 24 15:36 EST 2020. Contains 332209 sequences. (Running on oeis4.)