Sum of the numerators for computing the fourth moment of the probability mass function for the number of involutions with k 2-cycles in n elements (A000085) assuming equal likelihood.
A174782
Sum of the numerators for computing the fourth moment of the probability mass function for the number of involutions with k 2-cycles in n elements (A000085) assuming equal likelihood.
Terms
- a(0) =0a(1) =1a(2) =3a(3) =54a(4) =250a(5) =1950a(6) =10206a(7) =64288a(8) =350064a(9) =2065500a(10) =11509300a(11) =66905256a(12) =380767608a(13) =2226036904a(14) =12949377000a(15) =76842172800a(16) =457297336576
External references
- oeis: A174782