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1, 2, 9, 56, 420, 3564, 33033, 327184, 3413124, 37119160, 417733316, 4837527072, 57397642640, 695394516600, 8579210711625, 107541060458400, 1367139314643300, 17599273282621800, 229116465142280100, 3013124257920348000, 39991185556010816400
(列表;图表;参考;听;历史;文本;内部格式)
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