OFFSET
6,1
COMMENTS
A nontrivial cycle has size > 1.
LINKS
Alois P. Heinz, Table of n, a(n) for n = 6..450
Wikipedia, Permutation
FORMULA
E.g.f.: (-log(1-x)-x)^3/3!*exp(x).
MATHEMATICA
Drop [Range[0, 30]! CoefficientList[Series[(-Log[1 - x] - x)^3 / 3! Exp[x], {x, 0, 30}], x], 6] (* Vincenzo Librandi, Jul 22 2017 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Alois P. Heinz, Jul 16 2017
STATUS
approved