Irregular triangular array read by rows: T(n,k) is the number of non-isomorphic unlabeled weakly connected digraphs on n nodes and with k arcs.
A283753
Irregular triangular array read by rows: T(n,k) is the number of non-isomorphic unlabeled weakly connected digraphs on n nodes and with k arcs.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =3a(4) =4a(5) =4a(6) =1a(7) =1a(8) =8a(9) =22a(10) =37a(11) =47a(12) =38a(13) =27a(14) =13a(15) =5a(16) =1a(17) =1a(18) =27a(19) =108a(20) =326a(21) =667a(22) =1127a(23) =1477a(24) =1665a(25) =1489a(26) =1154a(27) =707a(28) =379a(29) =154
External references
- oeis: A283753