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Is this what you want?

sage: R = BooleanPolynomialRing(10, 'x')                                                  
sage: R                                                                                   
Boolean PolynomialRing in x0, x1, x2, x3, x4, x5, x6, x7, x8, x9
sage: x = R.gens()                                                                        
sage: x                                                                                   
(x0, x1, x2, x3, x4, x5, x6, x7, x8, x9)
sage: x[2]                                                                                
x2