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1, 1, 3, 13, 75, 541, 4683, 47293, 545835, 7087261, 102247563, 1520385010, 23523325304, 380789137336, 6467270373536, 115360990236256, 2161133759447744, 42490485277902688, 875847933546165968, 18903517993567133752, 426618313415065361204, 10043227358229156346032
(列表;图表;参考;听;历史;文本;内部格式)
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