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0, 2, 6, 20, 68, 230, 778, 2632, 8904, 30122, 101902, 344732, 1166220, 3945294, 13346834, 45152016, 152748176, 516743378, 1748130326, 5913882532, 20006521300, 67681576758, 228965134106, 774583500376, 2620397211992, 8864740270458
(列表;图表;参考;听;历史;文本;内部格式)
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