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1, 5, 19, 71, 273, 1081, 4367, 17835, 73165, 300317, 1230795, 5031439, 20509577, 83366913, 337984903, 1367085683, 5518563909, 22239268069, 89495156291, 359724017367, 1444513666561, 5796069718985, 23241810818559, 93150299455291
(列表;图表;参考;听;历史;文本;内部格式)
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