Triangle of number of (weakly) connected unlabeled digraphs with n nodes and k arcs (n >=2, k >= 1).
A054733
Triangle of number of (weakly) connected unlabeled digraphs with n nodes and k arcs (n >=2, k >= 1).
Terms
- a(0) =1a(1) =1a(2) =0a(3) =3a(4) =4a(5) =4a(6) =1a(7) =1a(8) =0a(9) =0a(10) =8a(11) =22a(12) =37a(13) =47a(14) =38a(15) =27a(16) =13a(17) =5a(18) =1a(19) =1a(20) =0a(21) =0a(22) =0a(23) =27a(24) =108a(25) =326a(26) =667a(27) =1127a(28) =1477a(29) =1665
External references
- oeis: A054733