Number of connectedness systems on n vertices that contain all singletons and the set of all the vertices.
A072447
Number of connectedness systems on n vertices that contain all singletons and the set of all the vertices.
Terms
- a(0) =1a(1) =1a(2) =8a(3) =378a(4) =252000a(5) =18687534984
External references
- oeis: A072447