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1, 1, 1, 2, 4, 9, 20, 48, 113, 275, 667, 1627, 3951, 9597, 23215, 56063, 134982, 324340, 777492, 1860365, 4442905, 10593324, 25217480, 59944219, 142295011, 337344737, 798769090, 1889131816, 4462891151, 10531873564, 24828302752
(列表;图表;参考;听;历史;文本;内部格式)
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