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1, 9, 77, 694, 6774, 71820, 826020, 10265040, 137275920, 1967222880, 30092580000, 489584390400, 8443643040000, 153903497126400, 2956596769728000, 59712542813952000, 1264947863784192000, 28047600771531264000, 649672514944814592000, 15692497566512836608000, 394613964462556016640000
(列表;图表;参考;听;历史;文本;内部格式)
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