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1, 4, 16, 62, 239, 920, 3540, 13620, 52401, 201604, 775636, 2984122, 11480879, 44170640, 169938680, 653808840, 2515413201, 9677604804, 37232862856, 143246816182, 551116641919, 2120323237160, 8157566453420, 31384785713660, 120747379738401
(列表;图表;参考;听;历史;文本;内部格式)
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