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1, 3, 21, 138, 1029, 7878, 62751, 508521, 4185885, 34819986, 292135143, 2467528563, 20958538377, 178846047741, 1532203949982, 13171424183184, 113562780734352, 981679181808261, 8505577753517235, 73846557073784937, 642328501788394527
(列表;图表;参考;听;历史;文本;内部格式)
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