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1, -3, 9, -24, 57, -126, 264, -528, 1017, -1896, 3438, -6084, 10536, -17898, 29880, -49104, 79545, -127170, 200856, -313692, 484830, -742080, 1125540, -1692648, 2525160, -3738765, 5496246, -8025432, 11643576, -16790310, 24072048, -34321560, 48677625
(列表;图表;参考;听;历史;文本;内部格式)
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