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1, 1, 2, 6, 20, 85, 420, 2443, 16136, 120222, 993770, 9042451, 89725944, 964693717, 11168801294, 138549935190, 1833264311504, 25773751694161, 383664263687964, 6028473673565695, 99710105438401940, 1731651866118338766, 31505416776034601510, 599259743707431667279
(列表;图表;参考;听;历史;文本;内部格式)
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