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0, 0, 1, 2, 6, 19, 58, 195, 651, 2294, 8122, 29607, 108276, 401389, 1494268, 5600204, 21065520, 79567572, 301448098, 1145448216, 4363328350, 16659757647, 63740548126, 244337865925, 938252884294, 3608661283038, 13900010654999, 53614312021527, 207062098878276
(列表;图表;参考;听;历史;文本;内部格式)
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