✓ Mathematica : cpu = 0.0567986 (sec), leaf count = 35
DSolve[-4*(1 + 3*x)*y[x] + x*(4 + 10*x)*Derivative[1][y][x] - x^2*(2 + 4*x)*Derivative[2][y][x] + x^3*(1 + x)*Derivative[3][y][x] == 0,y[x],x]
✓ Maple : cpu = 0.368 (sec), leaf count = 28
dsolve((1+x)*x^3*diff(diff(diff(y(x),x),x),x)-(4*x+2)*x^2*diff(diff(y(x),x),x)+(10*x+4)*x*diff(y(x),x)-4*(3*x+1)*y(x)=0,y(x))