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1, 3, 12, 41, 164, 590, 2360, 8715, 34860, 130776, 523104, 1983212, 7932848, 30303416, 121213664, 465673065, 1862692260, 7187760140, 28751040560, 111338982436, 445355929744, 1729672999418, 6918691997672, 26936111629934, 107744446519736, 420338301077100
(列表;图表;参考;听;历史;文本;内部格式)
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