Triangular array read by rows: T(n,k) is the number of n-permutations that have exactly k distinct cycle lengths.

A218868

Triangular array read by rows: T(n,k) is the number of n-permutations that have exactly k distinct cycle lengths.

Terms

    a(0) =1a(1) =2a(2) =3a(3) =3a(4) =10a(5) =14a(6) =25a(7) =95a(8) =176a(9) =424a(10) =120a(11) =721a(12) =3269a(13) =1050a(14) =6406a(15) =21202a(16) =12712a(17) =42561a(18) =178443a(19) =141876a(20) =436402a(21) =1622798a(22) =1418400a(23) =151200a(24) =3628801a(25) =17064179a(26) =17061660a(27) =2162160a(28) =48073796a(29) =177093256

External references