A159726 Number of permutations of 3 indistinguishable copies of 1..n arranged in a circle with exactly 6 local maxima.

0, 0, 0, 1256, 24483200, 55067152128, 57615626479712, 41069543783239872, 23516539818144774912, 11776285299306762639680, 5412720242324956991133440, 2351154988094363114287766016, 983075755980176565659196488192, 400400884398187607904444939190272

Offset

1,4

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), [6])[1]} \\ Andrew Howroyd, May 14 2020

Crossrefs

Cf. A159721, A159722, A334778.

Sequence in context: A237562 A304829 A216941 * A048130 A256652 A211773

Adjacent sequences: A159723 A159724 A159725 * A159727 A159728 A159729

Keyword

nonn

Author

R. H. Hardin, Apr 20 2009

Extensions

Terms a(8) and beyond from Andrew Howroyd, May 14 2020

Status

approved