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1, 1, 4, 11, 40, 145, 557, 2204, 8878, 36670, 153158, 649421, 2779083, 12009927, 52301065, 229322103, 1011602788, 4485941698, 19989047298, 89445085086, 401786301272, 1811068535817, 8189394966213, 37138317913733, 168865708226573, 769695000793202, 3516190063129191, 16096483440690982
(列表;图表;参考;听;历史;文本;内部格式)
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