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1, 1, 2, 4, 9, 20, 45, 101, 228, 514, 1160, 2617, 5906, 13327, 30075, 67868, 153156, 345621, 779953, 1760094, 3971951, 8963378, 20227382, 45646511, 103009086, 232457449, 524579615, 1183802763, 2671451479, 6028582814, 13604518396, 30700900429, 69281782713
(列表;图表;参考;听;历史;文本;内部格式)
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