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1, 1, 2, 5, 17, 73, 398, 2636, 20542, 182750, 1819148, 19976248, 239570876, 3113794652, 43590340840, 653842358768, 10461418047368, 177843819947656, 3201187351520912, 60822552609266720, 1216451015967652048, 25545471145831066448, 562000364198246159456
(列表;图表;参考;听;历史;文本;内部格式)
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