Find a General Term an for the Sequence Whose First $\frac { 1 } { 1 } , \frac { 1 } { 4 } , \frac { 1 } { 9 } , \frac { 1 } { 16 } , \ldots$

Multiple Choice

Find a general term an for the sequence whose first four terms are given.
- $\frac { 1 } { 1 } , \frac { 1 } { 4 } , \frac { 1 } { 9 } , \frac { 1 } { 16 } , \ldots$

A) $a _ { n } = \frac { 1 } { n ^ { 2 } }$
B) $a _ { n } = \left( \frac { 1 } { 2 } \right) ^ { n - 1 }$
C) $a _ { n } = \frac { 1 } { 3 n - 2 }$
D) $a _ { n } = \frac { 1 } { n ^ { n - 1 } }$