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1, 1, 2, 3, 6, 10, 20, 37, 76, 153, 328, 705, 1576, 3551, 8179, 18980, 44559, 105111, 249426, 593484, 1416269, 3384581, 8099819, 19398194, 46487665, 111447044, 267260387, 641022947, 1537706522, 3688974818, 8850411933, 21234093757, 50946316856, 122234742311
(列表;图表;参考;听;历史;文本;内部格式)
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