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1, 1, 3, 10, 40, 154, 677, 2815, 12795, 55992, 260063, 1171488, 5519680, 25390443, 120790770, 563597058, 2701493583, 12740989900, 61404619312, 291993134549, 1413481335777, 6764629214481, 32860034334098, 158081263555453, 770095715645065, 3720320797966003, 18166699427992532, 88071146741870330
(列表;图表;参考;听;历史;文本;内部格式)
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