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1, 0, 9, 27, 90, 297, 1053, 3888, 14742, 56619, 219429, 857304, 3375999, 13391001, 53452467, 214525017, 865041606, 3502806363, 14237599635, 58069495188, 237583710549, 974819569095, 4010205424869, 16536842688267, 68344258564980
(列表;图表;参考;听;历史;文本;内部格式)
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