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0, 0, 0, 1, 5, 21, 84, 327, 1251, 4760, 18018, 68104, 257088, 970480, 3664070, 13842215, 52331695, 198021936, 750027090, 2843686271, 10792866315, 41006110365, 155961264880, 593797895358, 2263126224780, 8634161689920, 32973466762098, 126047166461574, 482298648250416, 1847156083546316
(列表;图表;参考;听;历史;文本;内部格式)
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