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A246527 Number of endofunctions on [n] whose cycle lengths are divisors of 7. 2
1, 1, 3, 16, 125, 1296, 16807, 262864, 4829049, 102073600, 2441582891, 65201946624, 1922453391157, 62009850843136, 2171369477933775, 82007515430081536, 3322113623606686193, 143662773881554108416, 6604529623711334804179, 321608928954695680000000 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

Alois P. Heinz, Table of n, a(n) for n = 0..350

FORMULA

E.g.f.: exp(Sum_{d|7} (-LambertW(-x))^d/d).

MAPLE

with(numtheory):

egf:= k-> exp(add((-LambertW(-x))^d/d, d=divisors(k))):

a:= n-> n!*coeff(series(egf(7), x, n+1), x, n):

seq(a(n), n=0..25);

# second Maple program:

with(combinat):

b:= proc(n, i) option remember; `if`(n=0, 1, `if`(i<1, 0,

      add(multinomial(n, n-i*j, i$j)/j!*b(n-i*j, i-1)*

      (i-1)!^j, j=0..`if`(irem(7, i)=0, n/i, 0))))

    end:

a:= n-> add(b(j, min(7, j))*n^(n-j)*binomial(n-1, j-1), j=0..n):

seq(a(n), n=0..25);

CROSSREFS

Column k=7 of A246522.

Sequence in context: A245012 A000951 A000272 * A159594 A246525 A193242

Adjacent sequences:  A246524 A246525 A246526 * A246528 A246529 A246530

KEYWORD

nonn

AUTHOR

Alois P. Heinz, Aug 28 2014

STATUS

approved

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Last modified October 19 00:36 EDT 2018. Contains 316327 sequences. (Running on oeis4.)