The total number of edges in all unlabeled directed graphs (no self loops allowed) on n nodes.
A199012
The total number of edges in all unlabeled directed graphs (no self loops allowed) on n nodes.
Terms
- a(0) =0a(1) =3a(2) =48a(3) =1308a(4) =96080a(5) =23114160a(6) =18522702240
External references
- oeis: A199012