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1, 1, 2, 6, 14, 84, 344, 2714, 15850, 158664, 1254536, 15066332, 151035364, 2091499222, 25438986270, 398610118170, 5712650790562, 99963273184972, 1649446030193764, 31890910904182000, 594935710367215600, 12604160312187654888, 262094375885982582488
(列表;图表;参考;听;历史;文本;内部格式)
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