Can the sum $\sum_{n=0}^{\infty} \frac{1}{a^{n(n+1)}}$ be explicitly evaluated?

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Can the sum $\sum_{n=0}^{\infty} \frac{1}{a^{n(n+1)}}$ be explicitly evaluated? Here $a>1$. It is clear that the sum converges by Root Test. But how to calculate the value of the sum?