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1, 1, 1, 2, 6, 17, 48, 144, 449, 1422, 4568, 14893, 49139, 163665, 549570, 1858754, 6326343, 21651064, 74462327, 257219221, 892047965, 3104749126, 10841192392, 37967942203, 133333407639, 469405472729, 1656383420850, 5857371543403, 20754268304707
(列表;图表;参考;听;历史;文本;内部格式)
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