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2, 3, 6, 20, 80, 420, 2520, 18144, 145152, 1330560, 13305600, 148262400, 1779148800, 23351328000, 326918592000, 4940103168000, 79041650688000, 1351612226764800, 24329020081766400, 464463110651904000, 9289262213038080000, 195848611658219520000
(列表;图表;参考;听;历史;文本;内部格式)
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