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A159716 Number of permutations of 2 indistinguishable copies of 1..n arranged in a circle with exactly 2 local maxima. 0
2, 66, 1168, 16220, 202416, 2395540, 27517568, 310123764, 3447919120 (list; graph; refs; listen; history; text; internal format)
OFFSET

2,1

LINKS

Table of n, a(n) for n=2..10.

CROSSREFS

Sequence in context: A226338 A131472 A098532 * A157060 A154637 A069865

Adjacent sequences:  A159713 A159714 A159715 * A159717 A159718 A159719

KEYWORD

nonn

AUTHOR

R. H. Hardin Apr 20 2009

STATUS

approved

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Last modified February 20 14:58 EST 2020. Contains 332078 sequences. (Running on oeis4.)