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1, 1, 4, 25, 218, 2475, 34696, 579223, 11220540, 247395097, 6117023600, 167639670441, 5044046990776, 165322086357715, 5863394794421088, 223751099288794375, 9141963589243198736, 398198217292835137137, 18420080017512816009280, 901874615547758970425977
(列表;图表;参考;听;历史;文本;内部格式)
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