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1, 0, 0, 6956, 44141, 482813, 2321121, 13270161, 52888984, 222985939, 773076890, 2713247555, 8451095075, 26173402583, 74876493333, 211438116567, 564402008802, 1483207883942, 3737481285011, 9267079836807, 22239355857266, 52539499752378, 120903852703049
(列表;图表;参考;听;历史;文本;内部格式)
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