Number of degree-n permutations such that number of cycles of size 2k is odd (or zero) for every k.
A130275
Number of degree-n permutations such that number of cycles of size 2k is odd (or zero) for every k.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =6a(4) =21a(5) =105a(6) =675a(7) =4725a(8) =35805a(9) =322245a(10) =3236625a(11) =35602875a(12) =425872755a(13) =5536345815a(14) =77347084815
External references
- oeis: A130275