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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 $n=1$ s=1$ we have the Dirichlet class number formula.

I would like to have some reference for $n\geq3$. s\geq2$. Thanks.-.

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Values of Dirichlet L-funcions at natural numbers

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.-.