Question: Why doesn't plot((-2)^x) produce any result?

Why doesn't 

plot((-2)^x, x = -2 .. 2)

produce anything?

I guess this is some kind of tricky function since for non-integer x it seems not to correspond to a real number.

This came up for me when thinking about a sequence n(c^n), where |c|<1.

Is there some way to plot the values of a sequence? 

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