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1, 1, 1, 2, 3, 7, 14, 37, 80, 222, 544, 1601, 4095, 12416, 33785, 105769, 293747, 935184, 2717376, 8848014, 26134254, 86210716, 262068267, 877833206, 2695238060, 9109101156, 28619396967, 97879220771, 310021153392, 1067906857449, 3440140082033, 11957123227292
(列表;图表;参考;听;历史;文本;内部格式)
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