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1, 5, 21, 88, 369, 1547, 6486, 27194, 114017, 478042, 2004299, 8403476, 35233470, 147724276, 619367372, 2596837513, 10887827441, 45649674187, 191396563242, 802473294131, 3364550422879, 14106637106664, 59145260271900, 247979854176461, 1039711513563070
(列表;图表;参考;听;历史;文本;内部格式)
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