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1, 0, 49896, 2821632, 50332590, 467596800, 2900976144, 13527005184, 51515674056, 166963872768, 479797555248, 1241996861952, 2970712710438, 6601476879360, 13877851716432, 27612993881088, 52754008389390, 96534440589312, 171306687302520, 293591846287872
(列表;图表;参考;听;历史;文本;内部格式)
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