The number of isolated nodes in all labeled directed graphs (with self loops allowed) on n nodes.
A197927
The number of isolated nodes in all labeled directed graphs (with self loops allowed) on n nodes.
Terms
- a(0) =0a(1) =1a(2) =4a(3) =48a(4) =2048a(5) =327680a(6) =201326592a(7) =481036337152
External references
- oeis: A197927