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2, 6, 36, 144, 4320, 64800, 777600, 65318400, 2743372800, 109734912000, 29628426240000, 3199870033920000, 383984404070400000, 12671485334323200000, 29271131122286592000000, 49175500285441474560000000, 3835689022264435015680000000, 1196734974946503724892160000000
(列表;图表;参考;听;历史;文本;内部格式)
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