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1, 1, 3, 8, 19, 51, 134, 354, 952, 2558, 6917, 18787, 51146, 139702, 382464, 1049221, 2883964, 7939822, 21891635, 60440322, 167068352, 462315544, 1280607173, 3550505517, 9852130198, 27359426032, 76031905038, 211433821121, 588332188162, 1638031887892
(列表;图表;参考文献;听;历史;文本;内部格式)
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