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1, 1, 4, 11, 40, 142, 540, 2009, 8017, 31012, 126096, 501651, 2065390, 8376028, 34811593, 143024546, 599037001, 2485562893, 10472855073, 43799101634, 185421645194, 780427538487, 3316944855477, 14032867218773, 59844292512609, 254259643037044, 1087478111800121, 4637070550057103
(列表;图表;参考;听;历史;文本;内部格式)
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