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Write an equation to describe the sequence below. Use $n$ to represent the position of a term in the sequence, where $n = 1$ for the first term. $\newline$$–8, \, –16, \, –32, \, \ldots$$\newline$Write your answer using decimals and integers.$\newline$$a_n =$$\_\_\_\_$$\left(\_\_\_\_\right)^{n - 1}$