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A159719 Number of permutations of 2 indistinguishable copies of 1..n arranged in a circle with exactly 5 local maxima. 2
0, 0, 0, 0, 1480, 1268292, 279561086, 36381368048, 3573883594170, 296395007981680, 22044296362400136, 1523944523765510064, 100158396249221188476, 6351609408030664973692, 392562103869990035520330, 23810390333486683269302048, 1424190819067621511845096358 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,5

LINKS

Andrew Howroyd, Table of n, a(n) for n = 1..200

PROG

(PARI) \\ CircPeaksBySig defined in A334778.

a(n) = {CircPeaksBySig(vector(n, i, 2), [5])[1]} \\ Andrew Howroyd, May 13 2020

CROSSREFS

Column 5 of A334778.

Cf. A159716.

Sequence in context: A188363 A334687 A255789 * A052167 A097024 A253331

Adjacent sequences:  A159716 A159717 A159718 * A159720 A159721 A159722

KEYWORD

nonn

AUTHOR

R. H. Hardin, Apr 20 2009

EXTENSIONS

Terms a(10) and beyond from Andrew Howroyd, May 13 2020

STATUS

approved

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Last modified January 21 01:45 EST 2022. Contains 350473 sequences. (Running on oeis4.)