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1, 2, 7, 26, 107, 435, 1864, 8017, 35094, 154374, 687651, 3070614, 13814330, 62358004, 282812259, 1285949237, 5868965797, 26844046407, 123111756347, 565732128917, 2605268895704, 12017396102369, 55531436300662, 256979255171808, 1190949754852390, 5526397573752574, 25676683605056729, 119431826709507381
(列表;图表;参考文献;听;历史;文本;内部格式)
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