#### Answer

$4,8,16,32,64$

#### Work Step by Step

In order to compute the fifth term we will have to plug $n =1,2,3,4,5$ into the given equation.
Initial term $a_1=4$
Now, we have $a_2=(2)(4)=8$;
$a_3=(2)(8)=16$; $a_4=(2)(16)=32$; $a_5=(2)(32)=64$
Thus, we have our required terms: $4,8,16,32,64$