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0, 1, 2, 9, 33, 167, 944, 6390, 49450, 434374, 4259184, 46122552, 546390012, 7027204428, 97489431360, 1450957014000, 23058303178896, 389666143681776, 6977203291635840, 131947560745672320, 2627899581335038560, 54977516540430772320, 1205366436933694882560
(列表;图表;参考文献;听;历史;文本;内部格式)
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