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1, 1, 2, 4, 9, 20, 48, 115, 285, 717, 1837, 4753, 12451, 32878, 87549, 234654, 632814, 1715446, 4672544, 12780511, 35091842, 96684570, 267223650, 740691451, 2058470490, 5734620428, 16011730686, 44799543203, 125587727914, 352696990890, 992169406959
(列表;图表;参考文献;听;历史;文本;内部格式)
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