Graph with no vertices:
result: 
unconnected: 0

Graph with one vertex:
result: 
unconnected: 0

Graph with two vertices:
result: 
unconnected: 1

Graph with two connected vertices:
result: 1
unconnected: 0

Graph with loops and multiple edges, undirected:
result: 6 3 1
unconnected: 5

Graph with loops and multiple edges, directed:
result: 7 5 1
unconnected: 17

