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1, 1, 2, 6, 22, 89, 381, 1694, 7744, 36168, 171831, 827814, 4034589, 19857262, 98555324, 492710856, 2478897620, 12541604830, 63768192378, 325674039636, 1669922290311, 8593644472017, 44369362778645, 229767801472366, 1193126351099007, 6211253430642091
(列表;图表;参考文献;听;历史;文本;内部格式)
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