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double integral problem

hi there,
im trying to evaluate the following double integral:
N[Integrate[Integrate[Exp[-a/(4 x) - 4 x], {x, 0, Q}], {Q, 0, 1}]]

and set a to 1 or some other non-zero number.

but for some reason, mathematica only gives me error messages. what am
i doing wrong?
best. regina

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