AMC 12 2009a Problem 25

The first two terms of a sequence are $a_1 = 1$ and $a_2 = \frac {1}{\sqrt3}$. For $n\ge1$,

What is $|a_{2009}|$?

\textbf{(A)}\ 0 \textbf{(B)}\ 2 - \sqrt3 \textbf{(C)}\ \frac {1}{\sqrt3} \textbf{(D)}\ 1 \textbf{(E)}\ 2 + \sqrt3