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1, 2, 8, 45, 322, 2730, 26004, 268554, 2940080, 33635316, 398300344, 4849845000, 60429982144, 767721774800, 9916427702880, 129937069996965, 1724052965464890, 23129299114182030, 313351935000465900, 4282621342230699930, 58994556159403576140, 818487022124443918740
(列表;图表;参考;听;历史;文本;内部格式)
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