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

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