Evaluating Certain $L$-functions

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I have found a systematic way to find the exact value of the $L$-series $$L(s,\chi)=\sum_{n=1}^\infty \frac{\chi(n)}{n^s}$$ for $s$ a positive even integer if $\chi(-1)=1$ and $s$ odd and positive if $\chi(-1)=-1$. Is this known? I haven't been able to find such results, other than the class number formula for $s=1$. I would appreciate if anyone would be able to help.