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1, 1, 3, 9, 31, 110, 417, 1610, 6443, 26109, 108187, 452431, 1920684, 8211507, 35485309, 154206122, 675502094, 2972505787, 13161176353, 58492256069, 261228659937, 1170349516612, 5264116418017, 23741320362089, 107423324472193, 487191992942365, 2215574902892336, 10096007665376051, 46112513697390089
(列表;图表;参考;听;历史;文本;内部格式)
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