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1, 4, 12, 210, 4290, 42840, 4037880, 73628100, 17226649440, 422630873280, 37569227295600, 25278012283043520, 37342441057521600, 1860812172555592576320, 6714127941651376646400, 13782919836150390515990400, 1090799084645723774857536000
(列表;图表;参考;听;历史;文本;内部格式)
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