A159719 Number of permutations of 2 indistinguishable copies of 1..n arranged in a circle with exactly 5 local maxima.

0, 0, 0, 0, 1480, 1268292, 279561086, 36381368048, 3573883594170, 296395007981680, 22044296362400136, 1523944523765510064, 100158396249221188476, 6351609408030664973692, 392562103869990035520330, 23810390333486683269302048, 1424190819067621511845096358

Offset: 1

Author

R. H. Hardin, Apr 20 2009

Keywords

• nonn

Links

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

Crossrefs

Column 5 of A334778.

Cf. A159716.

Programs

PARI

\\ CircPeaksBySig defined in A334778.
a(n) = {CircPeaksBySig(vector(n, i, 2), [5])[1]} \\ Andrew Howroyd, May 13 2020

Extensions

Terms a(10) and beyond from Andrew Howroyd, May 13 2020