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1, 2, 8, 42, 288, 2280, 21600, 226800, 2701440, 35199360, 504403200, 7783776000, 130288435200, 2322678758400, 44286571929600, 894449267712000, 19144352747520000, 431093162852352000, 10224590808047616000, 253873324553232384000, 6602896050191400960000
(列表;图表;参考;听;历史;文本;内部格式)
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