Evaluating $\int_0^{\infty} x^r \exp(e^{-s x}) e^{-ax^b}dx$

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Can you analytically evaluate the integral $$ \int_0^{\infty} x^r \exp(e^{-s x}) e^{-ax^b}dx, $$ where $s,r,a,b>0$ are constants, $e$ is the exponential?