A159724 Number of permutations of 3 indistinguishable copies of 1..n arranged in a circle with exactly 4 local maxima.

0, 0, 144, 174216, 57255120, 11991842928, 2031699317760, 307822441390848, 43794222405754752, 6002662060069524480, 803884492717330692096, 106029178904806181240832, 13837293346888202240065536, 1791753662455712320172064768, 230600676245973342632159477760

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, 3), [4])[1]} \\ Andrew Howroyd, May 14 2020

Crossrefs

Cf. A159721, A159722, A334778.

Sequence in context: A217339 A231827 A203098 * A221124 A008700 A047807

Adjacent sequences: A159721 A159722 A159723 * A159725 A159726 A159727

Keyword

nonn

Author

R. H. Hardin, Apr 20 2009

Extensions

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

Status

approved