code: def number_of_nonisomorphic_trees(order):
      """Returns the number of nonisomorphic trees
  
      Parameters
      ----------
      order : int
        order of the desired tree(s)
  
      Returns
      -------
      length : Number of nonisomorphic graphs for the given order
  
      References
      ----------
  
      """
      return sum(1 for _ in nonisomorphic_trees(order))
  
file_path: networkx/networkx/generators/nonisomorphic_trees.py
imports: import networkx
label_desc: Use image node_id 2 for calling a global function with example usage: number_of_nonisomorphic_trees(order) and returns: sum