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1, 1, 3, 7, 19, 60, 169, 539, 1713, 5412, 18241, 58932, 197794, 670464, 2252141, 7793403, 26523661, 91645156, 319356023, 1106651892, 3895231214, 13604856592, 47889319173, 169562551244, 598458138702, 2132024158112, 7562668836374, 26957742010368, 96480822451924, 344633309569472, 1238725757557789
(列表;图表;参考;听;历史;文本;内部格式)
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