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1, 6, 36, 210, 1230, 7200, 42150, 246750, 1444500, 8456250, 49503750, 289800000, 1696518750, 9931593750, 58140562500, 340360781250, 1992506718750, 11664337500000, 68284221093750, 399742792968750, 2340135070312500, 13699389316406250, 80197621933593750, 469485056250000000
(列表;图表;参考;听;历史;文本;内部格式)
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