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1, 6, 21, 308, 798, 4116, 51114, 126288, 502947, 1912318, 26074881, 55301652, 210871038, 643901916, 2416831656, 32128430000, 64611765009, 218800524222, 625968110257, 1971079800312, 6127902153366, 88805517515284, 163129580373222, 530136843388056
(列表;图表;参考;听;历史;文本;内部格式)
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