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1, 1, 2, 6, 24, 118, 672, 4256, 29176, 212586, 1625704, 12930160, 106242392, 897210996, 7756325952, 68422701792, 614341492144, 5602330498170, 51798365474872, 484856381630288, 4589003801130456, 43870126242653020, 423219224419273888, 4116816114087389056, 40351014094161799568, 398270701521760650532
(列表;图表;参考;听;历史;文本;内部格式)
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