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1, -3, 7, -16, 36, -81, 182, -409, 919, -2065, 4640, -10426, 23427, -52640, 118281, -265775, 597191, -1341876, 3015168, -6775021, 15223334, -34206521, 76861355, -172705897, 388066628, -871977798, 1959316327, -4402543824, 9892426177, -22228079851, 49946042055, -112227737784
(列表;图表;参考文献;听;历史;文本;内部格式)
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