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A088336 Number of permutations in the symmetric group S_n that have even number of transpositions in their cycle decomposition. 4
1, 1, 3, 18, 90, 480, 3360, 27720, 249480, 2479680, 27276480, 327650400 (list; graph; refs; listen; history; internal format)
OFFSET

1,3

FORMULA

E.g.f.: (exp(-x^2)+1)/(1-x)/2. - Vladeta Jovovic (vladeta(AT)eunet.rs), Nov 09 2003

CROSSREFS

Cf. A062282.

Sequence in context: A124811 A006568 A147518 * A133594 A092691 A064671

Adjacent sequences:  A088333 A088334 A088335 * A088337 A088338 A088339

KEYWORD

nonn

AUTHOR

Yuval Dekel (dekelyuval(AT)hotmail.com), Nov 07 2003

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Last modified February 17 04:56 EST 2012. Contains 205985 sequences.