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1, 1, 2, 6, 32, 218, 2060, 23054, 314242, 4897410, 87427276, 1741312444, 38482278928, 931618115860, 24554678866736, 699328394272236, 21410158708401980, 701011980397033052, 24445424273647475096, 904440666571331841992, 35386719095200164370912, 1459756349974815778252152
(列表;图表;参考;听;历史;文本;内部格式)
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