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1, 2, 4, 18, 34, 166, 544, 2222, 5396, 29622, 101276, 411206, 1170986, 5435466, 20007472, 90854146, 253956882, 1160301990, 4412414972, 18080729238, 56012061494, 275783908498, 1010620487696, 4103148863306, 12730394683264, 58227896627114, 223877604671508
(列表;图表;参考;听;历史;文本;内部格式)
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