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2, 2, 12, 126, 1800, 33540, 757680, 20149290, 616940520, 21378058800, 827126546400, 35346832387020, 1653593623521840, 84055016334088800, 4613207941230688800, 271883701342581277950, 17125855412989960236600, 1148187688612239672677280, 81635218693106948988998880
(列表;图表;参考;听;历史;文本;内部格式)
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