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1, 0, 270, 2871, 18171, 89991, 375741, 1380456, 4602852, 14210922, 41167332, 112987953, 296065548, 745155153, 1809970083, 4259274975, 9741874320, 21715729830, 47285705676, 100777629492, 210581716518, 432065232288, 871606268064, 1730764182321, 3386501211393
(列表;图表;参考;听;历史;文本;内部格式)
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