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-2, 3, 6, 21, 90, 429, 2184, 11628, 63954, 360525, 2072070, 12096045, 71524440, 427496076, 2578547760, 15675792072, 95951017602, 590842763469, 3657598059570, 22749427475775, 142096423925610, 890949529108485, 5605635937900320, 35380499289211440, 223951032734902200
(列表;图表;参考;听;历史;文本;内部格式)
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