Number of permutations of [n] such that the number of cycles of length k is zero or equals k for every k.
A372579
Number of permutations of [n] such that the number of cycles of length k is zero or equals k for every k.
Terms
- a(0) =1a(1) =1a(2) =0a(3) =0a(4) =3a(5) =15a(6) =0a(7) =0a(8) =0a(9) =2240a(10) =22400a(11) =0a(12) =0a(13) =4804800a(14) =67267200a(15) =0a(16) =3405402000a(17) =57891834000a(18) =0a(19) =0a(22) =0a(23) =0a(24) =0a(27) =0a(28) =0a(31) =0a(32) =0a(33) =0
External references
- oeis: A372579