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1, 1, 3, 7, 23, 66, 225, 776, 2686, 9613, 35294, 131500, 487822, 1863370, 7150828, 27545304, 106963502, 420425777, 1654948705, 6538318841, 26054053228, 104186093986, 417521937748, 1680762430371, 6798820903048, 27542555089030, 111905074491059, 456321106093605, 1864989229835936
(列表;图表;参考;听;历史;文本;内部格式)
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