A090694 - OEIS

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A090694

Number of permutations with self-conjugate cycle types.

0

1, 0, 3, 3, 20, 120, 210, 3640, 5264, 211680, 609840, 11517660, 68262480, 1000359360, 14082868800, 89182613520, 2391049140480, 13726429516800, 503669982816000, 2561900746204800, 134281295242698240, 983641429745694720

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OFFSET

1,3

LINKS

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

EXAMPLE

There are 3 permutations of degree 3 with self-conjugate cycle type [1,2].

CROSSREFS

Sequence in context: A304562 A157050 A059368 * A078431 A346750 A292953

Adjacent sequences: A090691 A090692 A090693 * A090695 A090696 A090697

KEYWORD

easy,nonn

AUTHOR

Vladeta Jovovic, Dec 19 2003

EXTENSIONS

More terms from David Wasserman, Feb 02 2006

STATUS

approved