Triangular array read by rows: T(n,k) is the number of n-permutations that are pure cycles having exactly k fixed points; n>=2, 0<=k<=n-2.

A211603

Triangular array read by rows: T(n,k) is the number of n-permutations that are pure cycles having exactly k fixed points; n>=2, 0<=k<=n-2.

Terms

    a(0) =1a(1) =2a(2) =3a(3) =6a(4) =8a(5) =6a(6) =24a(7) =30a(8) =20a(9) =10a(10) =120a(11) =144a(12) =90a(13) =40a(14) =15a(15) =720a(16) =840a(17) =504a(18) =210a(19) =70a(20) =21a(21) =5040a(22) =5760a(23) =3360a(24) =1344a(25) =420a(26) =112a(27) =28a(28) =40320a(29) =45360

External references