Number of permutations of symmetric group S_n with an odd number of cycles of length 2 or more.
A373340
Number of permutations of symmetric group S_n with an odd number of cycles of length 2 or more.
Terms
- a(0) =0a(1) =0a(2) =1a(3) =5a(4) =20a(5) =84a(6) =424a(7) =2680a(8) =20544a(9) =182336a(10) =1816448a(11) =19963008a(12) =239511040a(13) =3113532928a(14) =43589194752a(15) =653837290496
External references
- oeis: A373340