Find the General Term an of the Given Sequence $3,9,27,81,243 , \ldots$

Find the general term an of the given sequence.
- $3,9,27,81,243 , \ldots$

A) $a _ { n } = 3 ^ { n - 1 } + 2$
B) $a _ { n } = 3 + 6 ( n - 1 )$
C) $a _ { n } = 6 n$
D) $a _ { n } = 3 n$