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1, 2, 5, 15, 51, 204, 933, 5115, 32385, 245214, 2090961, 20648547, 221781915, 2679261840, 34419818241, 488332067679, 7271691132033, 118162937240730, 1998172269602685, 36552556172242359, 691550102624919651, 14056929989746659252
(列表;图表;参考;听;历史;文本;内部格式)
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