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1, 2, 6, 26, 190, 722, 7770, 50570, 303614, 4978898, 28560946, 249598010, 3921446506, 40463101850, 312501134098, 2922002830706, 81019507028734, 621574793581010, 6971887587108882, 67208089701951674, 1804527636721939490, 24767209606785282698, 246837597799949869378
(列表;图表;参考;听;历史;文本;内部格式)
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