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1, 1, 1, 1, 2, 4, 7, 11, 20, 40, 79, 147, 278, 550, 1110, 2204, 4352, 8708, 17689, 35971, 72933, 148271, 303582, 624132, 1283898, 2643354, 5458457, 11306443, 23460067, 48727689, 101363663, 211262307, 441026328, 921743772, 1928573045, 4040272335, 8474803721
(列表;图表;参考;听;历史;文本;内部格式)
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