I'm trying to use Maple to take the following integral for positive values of a, b, c and non-negative integers i and j.

I know that for fixed values of j and k this doable — for example, for j=k=0 Mathematica gives

I'm trying the following code in Maple:
![int(exp(-(x + y)/2)/(a*x + b*y + c), [x = 0 .. infinity, y = 0 .. infinity]) assuming (a::real, 0 < a, b::real, 0 < b, c::real, 0 < c)](https://www.mapleprimes.com/MapleImage.ashx?f=6d4b22ec964db1d97c1811ecf066c127.gif)
Am I doing anything wrong?