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1, 1, 4, 10, 20, 36, 64, 120, 240, 499, 1060, 2314, 5252, 12360, 29632, 70992, 168096, 392465, 905940, 2075314, 4730052, 10735516, 24258688, 54553000, 122076240, 271914499, 603183508, 1333268098, 2937818900, 6455143760, 14146816640, 30929336736, 67473335104
(列表;图表;参考;听;历史;文本;内部格式)
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