>>3
　p_0 = 4,　q_0 = 1,　r_0 = 4,
　p_1 = 0,　q_1 = 1,　r_1 = 0,
　p_2 = 4,　q_2 = 4,　r_2 = 1,
　p_3 = 20,　q_3 = 24,　r_3 = 0.83333333
　p_4 = 176,　q_4 = 204,　r_4 = 0.86274510
　p_5 = 1904,　q_5 = 2220,　r_5 = 0.85765766
　p_6 = 25344,　q_6 = 29520,　r_6 = 08585365854
　p_7 = 398016,　q_7 = 463680,　r_7 = 0.85838509
　p_8 = 7212096,　q_8 = 8401680,　r_8 = 0.858411175
　p_9 = 148078656,　q_9 = 172504080,　r_9 = 0.85840669
　p_10 = 3397674240,　q_10 = 3958113600,　r_10 = 0.85840746
　・・・
となったが。。。