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1, 0, 10, 20, 140, 616, 3444, 19440, 117975, 753500, 5068492, 35764092, 264044235, 2034636800, 16327586760, 136180742640, 1178372198220, 10561041814380, 97889061389210, 937053052507880, 9252175434771885, 94115781485796488, 985250825472122200
(列表;图表;参考;听;历史;文本;内部格式)
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