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0, 1, 3, 9, 27, 81, 242, 722, 2150, 6395, 19003, 56428, 167458, 496724, 1472835, 4365692, 12936998, 38327764, 113529027, 336221554, 995586119, 2947641940, 8726093434, 25829729702, 76450357119, 226257478851, 669566448376, 1981320898874, 5862583555761
(列表;图表;参考;听;历史;文本;内部格式)
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