Write the first five terms of the sequence defined by `a_n=(-1)^(n-1). 2^n`

Explanation

`(i)a_n=(-1)^(n-1). 2^n`


`a_1=(-1)^(1-1). 2^1=0`

`a_2=(-1)^(2-1). 2^2=-4`

`a_3=(-1)^(3-1). 2^3=8`

`a_4=(-1)^(4-1). 2^4=-16`

`a_5=(-1)^(5-1). 2^5=32`