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1, 1, 5, 31, 201, 1206, 6751, 36051, 187025, 954136, 4822527, 24251877, 121631329, 609151986, 3048441935, 15249510871, 76267672545, 381394509228, 1907131201327, 9536109476745, 47681856564305, 238413094649734, 1192076649237855, 5960416195898811
(列表;图表;参考;听;历史;文本;内部格式)
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