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1, 1, 3, 8, 25, 86, 294, 1040, 3833, 14386, 54712, 210824, 822979, 3247027, 12924638, 51841966, 209371068, 851006530, 3478406410, 14290345910, 58982156747, 244473647740, 1017286372274, 4248218090559, 17800061935502, 74813151306454, 315342569996696, 1332772451282701, 5647021916205779
(列表;图表;参考;听;历史;文本;内部格式)
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