A061123 - OEIS

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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

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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