Find a General Term an for the Geometric Sequence $$2 , - \frac { 1 } { 2 } , \frac { 1 } { 8 } , - \frac { 1 } { 32 } , \frac { 1 } { 128 } \ldots$$

Find a general term an for the geometric sequence.
- $$2 , - \frac { 1 } { 2 } , \frac { 1 } { 8 } , - \frac { 1 } { 32 } , \frac { 1 } { 128 } \ldots$$

A) $a _ { n } = 2 \left( \frac { 1 } { 4 } \right) ^ { n }$
B) $a _ { n } = 2 \left( - \frac { 1 } { 4 } \right) ^ { n - 1 }$
C) $a _ { n } = 6 \left( - \frac { 1 } { 6 } \right) ^ { n - 1 }$
D) $a _ { n } = \frac { 1 } { 2 } ( - 4 ) n - 1$

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