Compute sum of a power series

1. May 3, 2012

blak97

1. The problem statement, all variables and given/known data
Explicitly compute the function g defined by:
g(x) = $\Sigma$n2x2n from n=1 to infinity

I was thinking something along the lines of differentiating$\Sigma$ x2n twice
1. The problem statement, all variables and given/known data

2. Relevant equations

3. The attempt at a solution

2. May 3, 2012

micromass

Yes. So what do you get??