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1, 2, 7, 26, 108, 453, 1991, 8790, 39647, 180294, 830133, 3845731, 17942624, 84128745, 396273416, 1873685843, 8891491081, 42325910206, 202038233279, 966747007053, 4635954881058, 22274520067968, 107215199263234, 516921586838909, 2496056612046261, 12069429770343532, 58434997240255297, 283249692910273673
(列表;图表;参考文献;听;历史;文本;内部格式)
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