A159730 Number of permutations of 4 indistinguishable copies of 1..n arranged in a circle with exactly 4 local maxima.

0, 2, 15042, 18059184, 11195742340, 5293792219344, 2205450812336100, 861515212667884608, 324837276666570610668, 119915580982794765091280, 43656420088142545411963444, 15735834864508561392982184160, 5628506716816811122561964710428, 2000722502787397537117555256499248

Offset: 1

Author

R. H. Hardin, Apr 20 2009

Keywords

• nonn

Links

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

Crossrefs

Cf. A159727, A159728, A334778.

Programs

PARI

\\ CircPeaksBySig defined in A334778.
a(n) = {CircPeaksBySig(vector(n, i, 4), [4])[1]} \\ Andrew Howroyd, May 14 2020

Extensions

Terms a(7) and beyond from Andrew Howroyd, May 14 2020