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1, 2, 1, 2, 3, 9, 27, 92, 313, 1083, 3753, 13063, 45581, 159501, 559549, 1967878, 6937267, 24511653, 86797683, 308003549, 1095155727, 3901490015, 13924590847, 49784694997, 178293760747, 639543538859, 2297555097259, 8265957750659
(列表;图表;参考;听;历史;文本;内部格式)
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