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1, 1, 3, 9, 25, 68, 189, 549, 1677, 5364, 17809, 60822, 212095, 751078, 2690809, 9727597, 35423189, 129775844, 477900825, 1767787458, 6565168975, 24468364150, 91486757921, 343068002234, 1289920924515, 4861979955858, 18367420180989, 69533685133704, 263748220185787, 1002242753522250
(列表;图表;参考;听;历史;文本;内部格式)
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