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1, 1, 2, 9, 40, 192, 959, 4988, 26587, 144672, 800229, 4486914, 25444355, 145681030, 840988369, 4889658927, 28607653570, 168299372745, 994978254267, 5908150711835, 35221346706997, 210723727773531, 1264832205228154, 7614504644529573, 45965528482747194, 278169935575048042, 1687298108487873673, 10256585388232231101, 62470753620679133927, 381201089984659788693, 2330136670337522460729, 14266260150998229954489
(列表;图表;参考;听;历史;文本;内部格式)
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