I want to know about reference of formulas for 
$$
L(s,D)=\sum_{n=1}^\infty \left(\frac{D}{n}\right)\,n^{-s}
$$
for $s$ a positive integer number and $D$ a fundamental discriminant. For $n=1$ we have the *Dirichlet class number formula*. 

I would like to have some reference for $n\geq3$. Thanks.-.