Answer
$a_1=3
\\a_2=9
\\a_3 = 27
\\a_4 = 81$
Work Step by Step
To find the first four terms of the given sequence, substitute 1, 2, 3, and 4 to $n$, respectively, then simplify.
$a_1 = 3^1 = 3
\\a_2 = 3^2 = 3(3) = 9
\\a_3 = 3^3 = 3(3)(3) = 27
\\a_4 = 3^4 = 3(3)(3)(3) = 81$
