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1, 1, 2, 4, 12, 35, 117, 411, 1506, 5704, 22264, 89210, 364866, 1519775, 6428590, 27566348, 119608685, 524401151, 2320439335, 10352516502, 46528515117, 210506616379, 958095048741, 4384343748847, 20162363200059, 93139026062773, 432026004199393, 2011542030756609, 9398497710827789
(列表;图表;参考文献;听;历史;文本;内部格式)
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