A159723 - OEIS

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A159723

Number of permutations of 3 indistinguishable copies of 1..n arranged in a circle with exactly 3 local maxima.

1

0, 2, 924, 130672, 11798800, 882163680, 60299781248, 3933244436480, 249755233812480, 15590436752711680, 961617113393102848, 58776390094965178368, 3566492692755774439424, 215104023517101044006912, 12906638765341805641728000, 770965701556822810254376960

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,2

LINKS

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

PROG

(PARI) \\ CircPeaksBySig defined in A334778.

a(n) = {CircPeaksBySig(vector(n, i, 3), [3])[1]} \\ Andrew Howroyd, May 13 2020

CROSSREFS

Cf. A159721, A159722, A334778.

Sequence in context: A203609 A265617 A324597 * A282346 A070967 A070927

Adjacent sequences: A159720 A159721 A159722 * A159724 A159725 A159726

KEYWORD

nonn

AUTHOR

R. H. Hardin, Apr 20 2009

EXTENSIONS

Terms a(9) and beyond from Andrew Howroyd, May 13 2020

STATUS

approved