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1, 1, 1, 2, 7, 39, 282, 2476, 25468, 300104, 3984742, 58857048, 957156654, 16992957454, 327018332848, 6780662275976, 150700528101856, 3573879622264536, 90079771978313256, 2404666535666287000, 67774524657985373248, 2011157217480732750512, 62675350084052135287072
(列表;图表;参考;听;历史;文本;内部格式)
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