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1, -1, 1, -2, 5, -13, 35, -98, 282, -832, 2505, -7662, 23715, -74104, 233429, -740511, 2363816, -7587409, 24473880, -79289278, 257890856, -841789791, 2756618710, -9053837032, 29817032534, -98441372386, 325753459625, -1080250590778
(列表;图表;参考;听;历史;文本;内部格式)
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