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A334779 Number of permutations of 2 indistinguishable copies of 1..n arranged in a circle with exactly n local maxima. 2
1, 1, 2, 6, 88, 1480, 40272, 1476944, 71865728, 4454840448, 343059301120, 32120367997696, 3593423957597184, 473387964389590016, 72533147097036867584, 12789470502905585018880, 2571336187676016073080832, 584713932920281483718459392, 149314675071137196105777217536 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

Andrew Howroyd, Table of n, a(n) for n = 0..100

PROG

(PARI) \\ CircPeaksBySig defined in A334778.

a(n) = {if(n==0, 1, CircPeaksBySig(vector(n, i, 2), [n])[1])} \\ Andrew Howroyd, May 13 2020

CROSSREFS

Main diagonal of A334778.

Sequence in context: A109892 A268534 A055702 * A305598 A179214 A128265

Adjacent sequences:  A334776 A334777 A334778 * A334780 A334781 A334782

KEYWORD

nonn

AUTHOR

Andrew Howroyd, May 13 2020

STATUS

approved

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Last modified March 8 01:41 EST 2021. Contains 341934 sequences. (Running on oeis4.)