Printing all possible combinations of brackets

Write a function Brackets(int n) that prints all combinations of well-formed brackets. For Brackets(3) the output would be

((())) (()()) (())() ()(()) ()()()

def brackets(n):
        if n == 2:
                return ["()"]
        else:
                L = []
                for b in brackets(n-2):
                        L.append( "(" + b + ")" )
                        L.append( "()" + b )
                        if not b.find ( "((" ):
                                L.append( b + "()" )
                return L

print brackets(2)
print brackets(6)