✓ Mathematica : cpu = 0.0060648 (sec), leaf count = 24
DSolve[-(a*x^2) - y[x] + x*Derivative[1][y][x] + x^2*Derivative[2][y][x] == 0,y[x],x]
✓ Maple : cpu = 0.02 (sec), leaf count = 19
dsolve(x^2*diff(diff(y(x),x),x)+x*diff(y(x),x)-y(x)-a*x^2=0,y(x))