Triangle read by rows: T(n,k) is the number of unlabeled acyclic digraphs with n >= 0 nodes and n-k outnodes (0 <= k <= n).
A122078
Triangle read by rows: T(n,k) is the number of unlabeled acyclic digraphs with n >= 0 nodes and n-k outnodes (0 <= k <= n).
Terms
- a(0) =1a(1) =1a(2) =0a(3) =1a(4) =1a(5) =0a(6) =1a(7) =2a(8) =3a(9) =0a(10) =1a(11) =3a(12) =11a(13) =16a(14) =0a(15) =1a(16) =4a(17) =25a(18) =108a(19) =164a(20) =0a(21) =1a(22) =5a(23) =47a(24) =422a(25) =2168a(26) =3341a(27) =0a(28) =1a(29) =6
External references
- oeis: A122078