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A088506
Number of permutations in the symmetric group S_n that have odd number of transpositions in their cycle decomposition.
5
0, 0, 1, 3, 6, 30, 240, 1680, 12600, 113400, 1149120, 12640320, 151351200, 1967565600, 27554567040, 413318505600, 6612836630400, 112418222716800, 2023536830515200, 38447199779788800, 768943660374489600, 16147816867864281600, 355251985172308224000
OFFSET
0,4
LINKS
FORMULA
a(n) = n! - A088336(n).
E.g.f.: (1 - exp(-x^2))/(2*(1 - x)). - Ilya Gutkovskiy, Jan 23 2018
CROSSREFS
Sequence in context: A347925 A262022 A088436 * A061137 A012280 A282132
KEYWORD
nonn
AUTHOR
Yuval Dekel (dekelyuval(AT)hotmail.com), Nov 13 2003
EXTENSIONS
More terms from Alois P. Heinz, Jun 14 2015
STATUS
approved