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2, 4, 10, 27, 80, 230, 644, 1780, 4879, 13315, 36261, 98650, 268260, 729326, 1982655, 5389579, 14650584, 39824632, 108254817, 294267376, 799901968, 2174359323, 5910521810, 16066464445, 43673178798, 118716008808, 322703570021, 877199250941
(列表;图表;参考;听;历史;文本;内部格式)
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