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1, 2, 6, 22, 92, 428, 2208, 12756, 83848, 635392, 5563952, 55743168, 628294912, 7832530400, 106515280064, 1564127939088, 24618706734432, 413015301455040, 7352809011276096, 138398862650413248, 2745596388858393984, 57248882869605962880, 1251574614271552264704, 28625091198273426059136
(列表;图表;参考;听;历史;文本;内部格式)
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