Find the Radius of Convergence Of $\sum _ { n = 1 } ^ { \infty } \frac { n } { 2 \cdot 5 \cdot 8 \cdots \cdot ( 3 n - 1 ) } x ^ { n }$

Find the radius of convergence of $\sum _ { n = 1 } ^ { \infty } \frac { n } { 2 \cdot 5 \cdot 8 \cdots \cdot ( 3 n - 1 ) } x ^ { n }$ .