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1, 1, 4, 12, 44, 175, 718, 3052, 13308, 59139, 266974, 1220879, 5643562, 26327769, 123793450, 586078393, 2791408028, 13365916545, 64302770488, 310672722803, 1506737267266, 7332920012492, 35800278685252, 175286440178448, 860517328379634, 4234766396436095
(列表;图表;参考;听;历史;文本;内部格式)
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