观察一组数:3,-2,11,-12,37,-58,135,-248,第n个数是

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观察一组数:3,-2,11,-12,37,-58,135,-248,第n个数是

观察一组数:3,-2,11,-12,37,-58,135,-248,第n个数是
观察一组数:3,-2,11,-12,37,-58,135,-248,第n个数是

观察一组数:3,-2,11,-12,37,-58,135,-248,第n个数是
如下:
an=(-1)^(n+1)x2^n+n