Triangular array read by rows: T(n,k) is the number of ordered set partitions of {1,2,...,n} with exactly k singletons, n>=0, 0<=k<=n.

A187784

Triangular array read by rows: T(n,k) is the number of ordered set partitions of {1,2,...,n} with exactly k singletons, n>=0, 0<=k<=n.

Terms

    a(0) =1a(1) =0a(2) =1a(3) =1a(4) =0a(5) =2a(6) =1a(7) =6a(8) =0a(9) =6a(10) =7a(11) =8a(12) =36a(13) =0a(14) =24a(15) =21a(16) =100a(17) =60a(18) =240a(19) =0a(20) =120a(21) =141a(22) =372a(23) =1170a(24) =480a(25) =1800a(26) =0a(27) =720a(28) =743a(29) =3584

External references