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2, 6, 24, 114, 528, 2334, 9528, 36834, 135918, 484206, 1678152, 5694786, 19007808, 62625054, 204215340, 660445914, 2121665016, 6778399914, 21557206332, 68294432778, 215651021484, 679023425238, 2132750062560, 6684084844362, 20907052386534, 65279503654446
(列表;图表;参考;听;历史;文本;内部格式)
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