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1, 21, 420, 8400, 168000, 3360000, 67200000, 1344000000, 26880000000, 537600000000, 10752000000000, 215040000000000, 4300800000000000, 86016000000000000, 1720320000000000000, 34406400000000000000, 688128000000000000000, 13762560000000000000000, 275251200000000000000000
(列表;图表;参考;听;历史;文本;内部格式)
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