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-1, 1, -1, 3, -6, 18, -45, 136, -378, 1156, -3405, 10549, -32175, 100915, -314834, 998323, -3163683, 10127020, -32462265, 104751043, -338742887, 1100559573, -3583933846, 11711868458, -38358103030, 125974533997, -414566089320, 1367353737806, -4518185596293
(列表;图表;参考;听;历史;文本;内部格式)
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