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0, 2, 12, 52, 205, 786, 2996, 11432, 43749, 167950, 646635, 2496132, 9657687, 37442146, 145422660, 565722704, 2203961413, 8597496582, 33578000591, 131282408380, 513791607399, 2012616400058, 7890371113927, 30957699535752, 121548660036275
(列表;图表;参考;听;历史;文本;内部格式)
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