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1, -1, 2, -4, 6, -14, 20, -48, 70, -166, 252, -584, 924, -2092, 3432, -7616, 12870, -28102, 48620, -104824, 184756, -394404, 705432, -1494240, 2704156, -5692636, 10400600, -21785872, 40116600, -83688344, 155117520, -322494208, 601080390, -1246068806, 2333606220
(列表;图表;参考;听;历史;文本;内部格式)
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