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1, 4, 21, 127, 831, 5722, 40879, 300440, 2258455, 17291704, 134417955, 1058279251, 8422155293, 67647554826, 547699155261, 4465275681735, 36627214297455, 302067234113560, 2503174651819435, 20832888975309257, 174057811108059017, 1459365504991034106
(列表;图表;参考;听;历史;文本;内部格式)
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