✗ Mathematica : cpu = 29.874 (sec), leaf count = 0
DSolve[-(nu*(1 + x)*y[x]) + nu*(1 + 2*x)*Derivative[1][y][x] - x*(v + x)*Derivative[2][y][x] + x^2*Derivative[3][y][x] == 0,y[x],x]
, DifferentialRoot result
✓ Maple : cpu = 0.201 (sec), leaf count = 55
dsolve(x^2*diff(diff(diff(y(x),x),x),x)-(x+nu)*x*diff(diff(y(x),x),x)+nu*(2*x+1)*diff(y(x),x)-nu*(1+x)*y(x)=0,y(x))