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2, 4, 18, 44, 184, 444, 1826, 4388, 18022, 43300, 177856, 427348, 1755406, 4217900, 17325794, 41630540, 171004968, 410891868, 1687812450, 4055486788, 16658643286, 40027496964, 164420161936, 395069839924, 1622820610830, 3899323972492
(列表;图表;参考;听;历史;文本;内部格式)
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