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1, 9, 45, 249, 1665, 11817, 88725, 683289, 5381685, 43046889, 348684381, 2852823609, 23535840225, 195528140649, 1634056945605, 13726075481049, 115813764494505, 981010688215689, 8338590871415805, 71097458824894329, 607883273127192897
(列表;图表;参考;听;历史;文本;内部格式)
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