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1, 1, 2, 4, 11, 31, 92, 283, 893, 2875, 9407, 31189, 104555, 353794, 1206821, 4145350, 14326184, 49778473, 173794610, 609392578, 2145057797, 7577098816, 26850456704, 95425761829, 340047930692, 1214738997142, 4349231444405, 15604726428805, 56098211626478
(列表;图表;参考;听;历史;文本;内部格式)
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