For the first term, we have n=1:
$a_1 = \left(\frac{1}{2}\right)^1(1) = \frac{1}{2}$
For the second term, we have n=2:
$a_2 = \left(\frac{1}{2}\right)^2(2) = \frac{1}{4}(2) = \frac{1}{2}$
For the third term, we have n=3:
$a_3 = \left(\frac{1}{2}\right)^3(3) =
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