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1, 4, 20, 124, 936, 8424, 88648, 1072432, 14702720, 225692128, 3839770656, 71780577312, 1463532416320, 32337850727680, 770039603953664, 19664621381714944, 536234348295180288, 15554459021934423552, 478297493455731968512, 15543431292269887979008
(列表;图表;参考;听;历史;文本;内部格式)
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