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1, 1, 2, 3, 7, 15, 30, 66, 154, 352, 800, 1864, 4415, 10474, 24935, 59845, 144527, 350271, 852002, 2080955, 5100468, 12537191, 30900833, 76363218, 189162367, 469590870, 1168098275, 2911137073, 7267923924, 18174761288, 45519170649
(列表;图表;参考;听;历史;文本;内部格式)
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