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0, 1, 3, 9, 28, 90, 297, 1001, 3431, 11917, 41820, 147918, 526309, 1881009, 6744843, 24244145, 87300092, 314765506, 1135980801, 4102551897, 14823628015, 53581222773, 193724727804, 700551945014, 2533702591613, 9164618329825, 33151607475987, 119927166988761
(列表;图表;参考;听;历史;文本;内部格式)
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