parameters: (self, N)
return_statement: return self.__memo[N]
docstring: :type N: int
          :rtype: List[TreeNode]
docstring_summary: :type N: int
          :rtype: List[TreeNode]
docstring_tokens: : type N : int : rtype : List [ TreeNode ]
function: def allPossibleFBT(self, N):
          """
          :type N: int
          :rtype: List[TreeNode]
          """
          if N % 2 == 0:
              return []
  
          if N not in self.__memo:
              result = []
              for i in xrange(N):
                  for left in self.allPossibleFBT(i):
                      for right in self.allPossibleFBT(N-1-i):
                          node = TreeNode(0)
                          node.left = left
                          node.right = right
                          result.append(node)
              self.__memo[N] = result
  
          return self.__memo[N]
function_tokens: def allPossibleFBT ( self , N ) : if N % 2 == 0 : return [ ] if N not in self . __memo : result = [ ] for i in xrange ( N ) : for left in self . allPossibleFBT ( i ) : for right in self . allPossibleFBT ( N - 1 - i ) : node = TreeNode ( 0 ) node . left = left node . right = right result . append ( node ) self . __memo [ N ] = result return self . __memo [ N ]