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1, 1, 3, 10, 27, 79, 234, 686, 2036, 6080, 18224, 54920, 166245, 505201, 1541014, 4716540, 14480699, 44586619, 137648341, 425992838, 1321362034, 4107332002, 12792440104, 39915889304, 124762916912, 390594099694, 1224682772872, 3845389399882
(列表;图表;参考;听;历史;文本;内部格式)
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