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1, 0, 9, 9, 54, 99, 309, 684, 1720, 3909, 9036, 20178, 44676, 97191, 209151, 444498, 935002, 1947729, 4021429, 8234244, 16732173, 33758283, 67656843, 134751630, 266817214, 525411981, 1029271671, 2006453683, 3893241810, 7521104292, 14468931402, 27724579185
(列表;图表;参考;听;历史;文本;内部格式)
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