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A159719
Number of permutations of 2 indistinguishable copies of 1..n arranged in a circle with exactly 5 local maxima.
2
0, 0, 0, 0, 1480, 1268292, 279561086, 36381368048, 3573883594170, 296395007981680, 22044296362400136, 1523944523765510064, 100158396249221188476, 6351609408030664973692, 392562103869990035520330, 23810390333486683269302048, 1424190819067621511845096358
OFFSET
1,5
LINKS
PROG
(PARI) \\ CircPeaksBySig defined in A334778.
a(n) = {CircPeaksBySig(vector(n, i, 2), [5])[1]} \\ Andrew Howroyd, May 13 2020
CROSSREFS
Column 5 of A334778.
Cf. A159716.
Sequence in context: A188363 A334687 A255789 * A052167 A097024 A253331
KEYWORD
nonn
AUTHOR
R. H. Hardin, Apr 20 2009
EXTENSIONS
Terms a(10) and beyond from Andrew Howroyd, May 13 2020
STATUS
approved