A159732 Number of permutations of 4 indistinguishable copies of 1..n arranged in a circle with exactly 6 local maxima.

0, 0, 54, 12567720, 119680098150, 457910784728832, 1152580724912369872, 2325519418356488523376, 4138431357280201527601098, 6834997239521756743833978200, 10782136408891841006600677065580, 16520643455191910592561745395862392, 24835181066659843578699104675655772246

Offset

1,3

Links

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

Prog

(PARI) \\ CircPeaksBySig defined in A334778.
a(n) = {CircPeaksBySig(vector(n, i, 4), [6])[1]} \\ Andrew Howroyd, May 14 2020

Crossrefs

Cf. A159727, A159728, A334778.

Sequence in context: A151635 A363458 A218430 * A174946 A182119 A227856

Adjacent sequences: A159729 A159730 A159731 * A159733 A159734 A159735

Keyword

nonn

Author

R. H. Hardin, Apr 20 2009

Extensions

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

Status

approved