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1, 1, 3, 8, 27, 87, 324, 1157, 4635, 17413, 71379, 282310, 1184826, 4816221, 20574697, 85413385, 370033453, 1564014542, 6843477551, 29329378121, 129458112478, 561010625695, 2494707083517, 10912958247500, 48821550558187, 215277199846751, 968129245448296, 4297953300845067, 19417665080599818
(列表;图表;参考;听;历史;文本;内部格式)
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