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1, 1, 2, 6, 21, 77, 287, 1079, 4082, 15522, 59271, 227131, 873051, 3364827, 12998867, 50321075, 195162350, 758156366, 2949614789, 11490869489, 44819531180, 175009397380, 684059403670, 2676260628574, 10479320689274, 41065736472890, 161043272100440, 631974335773536
(列表;图表;参考;听;历史;文本;内部格式)
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