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2, 5, 11, 38, 174, 984, 6600, 51120, 448560, 4394880, 47537280, 562464000, 7224940800, 100111334400, 1488257971200, 23625316915200, 398840682240000, 7134671351808000, 134805535248384000, 2682594582700032000, 56078391288471552000, 1228615514129203200000
(列表;图表;参考;听;历史;文本;内部格式)
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