g(x) = 1+0.76518455*x^3 -0.21546428*x^6 -0.05346973*x^9 + 0.03292162*x^12+0.00123151*x^15-0.00430447*x^18+ 0.00066800*x^21+0.00050193*x^24-0.00017735*x^27- 0.00004243*x^30+0.00003128*x^33