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1, 1, 1, 2, 4, 9, 19, 45, 106, 260, 642, 1614, 4074, 10356, 26341, 67093, 170735, 434149, 1102279, 2794856, 7075440, 17887216, 45157381, 113859010, 286737286, 721310274, 1812628225, 4550676482, 11414249153, 28605296518, 71629527442
(列表;图表;参考;听;历史;文本;内部格式)
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