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0, 1, 0, 1, 1, 5, 13, 41, 121, 366, 1100, 3319, 10015, 30253, 91433, 276475, 836291, 2530321, 7657317, 23175867, 70150875, 212349687, 642803631, 1945819299, 5890003539, 17828324220, 53961228258, 163314594513, 494238394601, 1495593167851, 4525366817455
(列表;图表;参考;听;历史;文本;内部格式)
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