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0, 1, 2, 6, 20, 74, 294, 1228, 5318, 23662, 107512, 496726, 2326462, 11020424, 52706138, 254148326, 1234240140, 6031310162, 29635011990, 146323849876, 725635937678, 3612656833694, 18049975590512, 90474958563374, 454841633027198, 2292796383312656
(列表;图表;参考;听;历史;文本;内部格式)
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