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1, 2, 4, 12, 24, 168, 840, 2520, 27720, 471240, 942480, 12252240, 24504480, 465585120, 2327925600, 72165693600, 216497080800, 6278415343200, 144403552893600, 288807105787200, 12418705548849600, 509166927502833600, 18839176317604843200, 131874234223233902400, 6989334413831396827200, 328498717450075650878400
(列表;图表;参考;听;历史;文本;内部格式)
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