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1, 3, 15, 98, 756, 6534, 61347, 613470, 6447012, 70526404, 797490876, 9271926888, 110380082000, 1341117996300, 16586474042475, 208360804638150, 2653858669601700, 34220809160653500, 446174168961282300, 5875592302944678600, 78078028942687784400
(列表;图表;参考;听;历史;文本;内部格式)
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