The number of ordered pairs (G,S) where G is a simple labeled graph of order n and S is a subset of the vertices of G such that every element (vertex) in S is in the same connected component of G.

A249754

The number of ordered pairs (G,S) where G is a simple labeled graph of order n and S is a subset of the vertices of G such that every element (vertex) in S is in the same connected component of G.