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1, 1, 4, 9, 56, 185, 1632, 7217, 81664, 451089, 6241280, 41375609, 676506624, 5232134921, 98709925888, 872492313825, 18655203885056, 185503858236065, 4432984678858752, 48978641359097705, 1293646660855398400, 15722400263686662105, 454816628946740707328
(列表;图表;参考;听;历史;文本;内部格式)
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