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1, 2, 20, 43, 336, 687, 5440, 10943, 87296, 174847, 1397760, 2796543, 22368256, 44740607, 357908480, 715833343, 5726601216, 11453267967, 91625881600, 183252025343, 1466015154176, 2932031356927, 23456246661120, 46912497516543, 375299963355136, 750599943487487
(列表;图表;参考;听;历史;文本;内部格式)
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