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1, 20, 231, 2024, 14950, 98280, 593775, 3365856, 18156204, 94143280, 472733756, 2311801440, 11058116888, 51915526432, 239877544005, 1093260079344, 4923689695575, 21945588357420, 96926348578605, 424655979547800, 1847253511032930, 7984465725343800, 34315056105966195
(列表;图表;参考文献;听;历史;文本;内部格式)
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