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A324514 Number of aperiodic permutations of {1..n}. 6
1, 0, 3, 16, 115, 660, 5033, 39936, 362718, 3624920, 39916789, 478953648, 6227020787, 87177645996, 1307674338105, 20922779566080, 355687428095983, 6402373519409856, 121645100408831981, 2432902004460734000, 51090942171698415483, 1124000727695858073380 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

A permutation is defined to be aperiodic if every cyclic rotation of {1..n} acts on the cycle decomposition to produce a different digraph.

LINKS

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

Gus Wiseman, Cycle decompositions of the a(4) = 16 aperiodic permutations.

FORMULA

a(n) = A306669(n) * n.

a(n) = Sum_{d|n} mu(n/d)*(n/d)^d*d!. - Andrew Howroyd, Aug 19 2019

EXAMPLE

The a(4) = 16 aperiodic permutations:

  (1243) (1324) (1342) (1423)

  (2134) (2314) (2413) (2431)

  (3124) (3142) (3241) (3421)

  (4132) (4213) (4231) (4312)

MATHEMATICA

Table[Length[Select[Permutations[Range[n]], UnsameQ@@NestList[RotateRight[#/.k_Integer:>If[k==n, 1, k+1]]&, #, n-1]&]], {n, 6}]

PROG

(PARI) a(n) = sumdiv(n, d, moebius(n/d)*(n/d)^d*d!); \\ Andrew Howroyd, Aug 19 2019

CROSSREFS

Cf. A000740, A000939, A027375, A061417, A079128, A086675, A192332, A323860, A323867, A323869.

Cf. A306669, A324461, A324462, A324512, A324513, A324514.

Sequence in context: A074523 A329113 A042437 * A334786 A159606 A211210

Adjacent sequences:  A324511 A324512 A324513 * A324515 A324516 A324517

KEYWORD

nonn

AUTHOR

Gus Wiseman, Mar 04 2019

EXTENSIONS

Terms a(10) and beyond from Andrew Howroyd, Aug 19 2019

STATUS

approved

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Last modified December 5 03:31 EST 2020. Contains 338943 sequences. (Running on oeis4.)