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3, 9, 54, 486, 5832, 87480, 1574640, 33067440, 793618560, 21427701120, 642831033600, 21213424108800, 763683267916800, 29783647448755200, 1250913192847718400, 56291093678147328000, 2701972496551071744000, 137800597324104658944000, 7441232255501651582976000
(列表;图表;参考;听;历史;文本;内部格式)
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