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1, 1, 1, 2, 5, 11, 28, 79, 215, 629, 1809, 5426, 16470, 50317, 155322, 483924, 1521732, 4822068, 15360504, 49144119, 158049374, 510824766, 1657541406, 5396486955, 17626155846, 57754129486, 189807753894, 625506513608, 2066420369017, 6842171033524
(列表;图表;参考;听;历史;文本;内部格式)
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