Irregular triangle read by rows: T(n,k), n >= 2, 1 <= k <= n/2, = number of rooted forests with n nodes and k trees, with at least two nodes in each tree.
A174135
Irregular triangle read by rows: T(n,k), n >= 2, 1 <= k <= n/2, = number of rooted forests with n nodes and k trees, with at least two nodes in each tree.
Terms
- a(0) =1a(1) =2a(2) =4a(3) =1a(4) =9a(5) =2a(6) =20a(7) =7a(8) =1a(9) =48a(10) =17a(11) =2a(12) =115a(13) =48a(14) =7a(15) =1a(16) =286a(17) =124a(18) =21a(19) =2a(20) =719a(21) =336a(22) =60a(23) =7a(24) =1a(25) =1842a(26) =888a(27) =171a(28) =21a(29) =2
External references
- oeis: A174135