Triangular array read by rows: T(n,k) is the number of forests of rooted trees on n labeled nodes with exactly k isolated nodes; n>=0, 0<=k<=n.
A219034
Triangular array read by rows: T(n,k) is the number of forests of rooted trees on n labeled nodes with exactly k isolated nodes; n>=0, 0<=k<=n.
Terms
- a(0) =1a(1) =0a(2) =1a(3) =2a(4) =0a(5) =1a(6) =9a(7) =6a(8) =0a(9) =1a(10) =76a(11) =36a(12) =12a(13) =0a(14) =1a(15) =805a(16) =380a(17) =90a(18) =20a(19) =0a(20) =1a(21) =10626a(22) =4830a(23) =1140a(24) =180a(25) =30a(26) =0a(27) =1a(28) =167839a(29) =74382
External references
- oeis: A219034