Draw all trees of n labeled vertices for n123?

Answer 1

i am n123

Answer 2

I can provide a list of combinations of trees with 1, 2, and 3 vertices. 1 labeled vertex:

• Vertex A 2 labeled vertices:
• Tree 1: Vertex A connected to Vertex B 3 labeled vertices:
• Tree 1: Vertex A connected to Vertex B, Vertex C disconnected from A and B