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1, 1, 2, 4, 10, 26, 72, 205, 600, 1790, 5428, 16676, 51800, 162408, 513288, 1633543, 5230506, 16838080, 54465356, 176933606, 577002976, 1888274740, 6199187904, 20411160754, 67384417204, 223006818992, 739711312416, 2458778309456
(列表;图表;参考;听;历史;文本;内部格式)
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