>>> archimede(4)
(96, 3.14103195089053)
>>> archimede(5)
(192, 3.1414524722853443)
>>> archimede(11)
(12288, 3.1415926186407894)
>>> archimede(12)
(24576, 3.1415926453212157)
>>> archimede(13)
(49152, 3.1415926453212157)
>>> archimede(14)
(98304, 3.1415926453212157)
>>> archimede(15)
(196608, 3.1415926453212157)
>>> archimede(16)
(393216, 3.141593669849427)