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0, 1, -1, 1, -1, 0, 5, -20, 55, -125, 250, -450, 725, -1000, 1000, 1, -3642, 13278, -35344, 81720, -174098, 352716, -694904, 1355322, -2652200, 5245956, -10491911, 21097440, -42262518, 83482620, -161013975, 300338820, -536165400, 903201960, -1401448500
(列表;图表;参考;听;历史;文本;内部格式)
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