Marinada '26

[lang=hr] Odredi vrijednost ove beskonačne sume $$S=\sum_{n=0}^{\infty} \frac{2^n}{3^{2^n}+1}$$ [/lang] [lang=en] Evaluate the following infinite series $$S=\sum_{n=0}^{\infty} \frac{2^n}{3^{2^n}+1}$$ [/lang]