code: def test_number_of_nonisomorphic_trees(self):
      # http://oeis.org/A000055
      assert nx.number_of_nonisomorphic_trees(2) == 1
      assert nx.number_of_nonisomorphic_trees(3) == 1
      assert nx.number_of_nonisomorphic_trees(4) == 2
      assert nx.number_of_nonisomorphic_trees(5) == 3
      assert nx.number_of_nonisomorphic_trees(6) == 6
      assert nx.number_of_nonisomorphic_trees(7) == 11
      assert nx.number_of_nonisomorphic_trees(8) == 23
  
file_path: networkx/networkx/generators/tests/test_nonisomorphic_trees.py
imports: import networkx
  from networkx.utils import edges_equal
label_desc: Use image node_id 3 for calling the TestGeneratorNonIsomorphicTrees obj's underlying member method code with example usage: obj.test_number_of_nonisomorphic_trees() without return types