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1, 1, 2, 3, 6, 60, 360, 70, 336, 756, 75600, 207900, 9979200, 25945920, 1816214400, 3405402000, 504504000, 308756448000, 505237824000, 52797352608000, 1055947052160000, 221748880953600, 12196188452448000, 280512334406304000, 2692918410300518400, 106557391987200000, 972442759275187200000
(列表;图表;参考;听;历史;文本;内部格式)
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