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1, 1, 1, 2, 4, 7, 14, 30, 63, 135, 297, 658, 1470, 3319, 7547, 17263, 39722, 91863, 213379, 497645, 1164859, 2735602, 6443750, 15220275, 36041685, 85546359, 203486990, 485000849, 1158133257, 2770323361, 6637570675, 15927592520, 38274809136, 92100301893
(列表;图表;参考;听;历史;文本;内部格式)
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