Evaluate (in a closed form, if possible) the series:

$$\sum_{n=1}^{\infty} \frac{(-1)^{n-1}}{n \tanh n}$$

Board index **‹** Computation of Series **‹** Closed series involving tanh
## Closed series involving tanh

Evaluate (in a closed form, if possible) the series:

$$\sum_{n=1}^{\infty} \frac{(-1)^{n-1}}{n \tanh n}$$

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$$\sum_{n=1}^{\infty} \frac{(-1)^{n-1}}{n \tanh n}$$

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