The number of connected components in all labeled directed graphs (with self loops allowed) on n nodes.
A197743
The number of connected components in all labeled directed graphs (with self loops allowed) on n nodes.
Terms
- a(0) =0a(1) =2a(2) =20a(3) =600a(4) =70048a(5) =34265920a(6) =69135737856
External references
- oeis: A197743