A061122 - OEIS

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A061122

Number of degree-n permutations of order exactly 8.

0, 0, 0, 0, 0, 0, 0, 5040, 45360, 453600, 3326400, 39916800, 363242880, 3874590720, 34767532800, 567177811200, 6897521030400, 98241008785920, 1138935652807680, 18952720774041600, 258251731634534400

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OFFSET

1,8

LINKS

Table of n, a(n) for n=1..21.

FORMULA

E.g.f.: -exp(x+1/2*x^2+1/4*x^4)+exp(x+1/2*x^2+1/4*x^4+1/8*x^8).

CROSSREFS

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

Sequence in context: A159083 A179731 A061140 * A029575 A179965 A191685

Adjacent sequences: A061119 A061120 A061121 * A061123 A061124 A061125

KEYWORD

easy,nonn

AUTHOR

Vladeta Jovovic, Apr 14 2001

STATUS

approved