Number of degree-n permutations without even cycles and such that number of cycles of size 2k-1 is odd (or zero) for every k.
A130648
Number of degree-n permutations without even cycles and such that number of cycles of size 2k-1 is odd (or zero) for every k.
Terms
- a(0) =1a(1) =1a(2) =0a(3) =3a(4) =8a(5) =25a(6) =184a(7) =721a(8) =9904a(9) =66753a(10) =691088a(11) =5973121a(12) =84925048a(13) =940427137a(14) =12801319816a(15) =186556383105
External references
- oeis: A130648