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1, 1, 3, 8, 22, 60, 167, 465, 1306, 3681, 10422, 29597, 84313, 240757, 689035, 1975753, 5675145, 16326198, 47032200, 135658367, 391733593, 1132357784, 3276330780, 9487885056, 27497891241, 79753806451, 231474005120, 672250119756, 1953523496677, 5680002466125
(列表;图表;参考;听;历史;文本;内部格式)
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