A061123 Number of degree-n permutations of order exactly 9.

0, 0, 0, 0, 0, 0, 0, 0, 40320, 403200, 2217600, 26611200, 259459200, 1695133440, 16345929600, 161902540800, 1208560953600, 50830132953600, 866513503215360, 8470676211379200, 166891791625977600, 2699606616475507200

Offset

1,9

Links

Table of n, a(n) for n=1..22.

Formula

E.g.f.: -exp(x+1/3*x^3)+exp(x+1/3*x^3+1/9*x^9).

Crossrefs

Cf. A000085, A001470, A001472, A052501, A053496-A053505, A001189, A001471, A001473, A061121-A061128.

Sequence in context: A284205 A239035 A179734 * A029576 A179966 A133068

Adjacent sequences: A061120 A061121 A061122 * A061124 A061125 A061126

Keyword

easy,nonn

Author

Vladeta Jovovic, Apr 14 2001

Status

approved