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1, 2, 6, 18, 70, 300, 1806, 9100, 37332, 205560, 4853530, 49841616, 789513660, 9021065872, 70737031470, 420565124400, 22959075244096, 385032305178720, 10010973102879762, 152163983393187400, 1498273284120348540, 15639918041915598816, 1296204202723400597110
(列表;图表;参考;听;历史;文本;内部格式)
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