Triangular array read by rows. T(n,k) is the number of partial permutations on [n] with exactly k connected components, n>=0, 0<=k<=n.

A350227

Triangular array read by rows. T(n,k) is the number of partial permutations on [n] with exactly k connected components, n>=0, 0<=k<=n.

Terms

    a(0) =1a(1) =0a(2) =2a(3) =0a(4) =3a(5) =4a(6) =0a(7) =8a(8) =18a(9) =8a(10) =0a(11) =30a(12) =91a(13) =72a(14) =16a(15) =0a(16) =144a(17) =540a(18) =590a(19) =240a(20) =32a(21) =0a(22) =840a(23) =3718a(24) =5085a(25) =2900a(26) =720a(27) =64a(28) =0a(29) =5760

External references