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0, 1, 1, 3, 8, 22, 64, 189, 577, 1788, 5642, 18016, 58213, 189792, 623913, 2065219, 6878429, 23032917, 77500237, 261892491, 888439320, 3024510467, 10329241959, 35379140285, 121502993735, 418306868672, 1443409882944, 4991122973019, 17292424070839, 60021140494647, 208684858267921
(列表;图表;参考;听;历史;文本;内部格式)
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