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1, 1, 3, 8, 26, 82, 285, 995, 3613, 13319, 50053, 190459, 733555, 2851945, 11181927, 44155907, 175470374, 701164361, 2815635000, 11356456980, 45986353012, 186882752814, 761942170718, 3115758466971, 12775760835540, 52516539411929, 216375430357044, 893403847582583
(列表;图表;参考;听;历史;文本;内部格式)
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