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1, 1, 4, 12, 45, 174, 693, 2891, 12156, 52538, 228973, 1012996, 4518961, 20342820, 92221108, 420719274, 1930067929, 8897118329, 41194214136, 191470957420, 893110958485, 4179139628301, 19612391986898, 92283693683299, 435288156265051, 2057796624112995, 9748277239594671, 46268733559268079
(列表;图表;参考;听;历史;文本;内部格式)
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