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1, 1, 1, 4, 9, 29, 90, 301, 1001, 3441, 11934, 42019, 149226, 534978, 1931540, 7020706, 25662825, 94288121, 347993910, 1289627931, 4796857230, 17902158534, 67016296620, 251577092029, 946844533674, 3572042403354, 13505406670700, 51166198378830, 194214400834356, 738494266832548
(列表;图表;参考;听;历史;文本;内部格式)
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