Number of permutations in the symmetric group S_n that have odd number of transpositions in their cycle decomposition.

A088506

Number of permutations in the symmetric group S_n that have odd number of transpositions in their cycle decomposition.

Terms

    a(0) =0a(1) =0a(2) =1a(3) =3a(4) =6a(5) =30a(6) =240a(7) =1680a(8) =12600a(9) =113400a(10) =1149120a(11) =12640320a(12) =151351200a(13) =1967565600a(14) =27554567040a(15) =413318505600

External references