vsota 6 + (1/(2*n^2) - 1/(2*n))/54 + (1/(6*n^3) - 1/(2*n^2) + 1/(3*n))/972 + 1/(3*n) Integrate[(-1 + {1 + x - x^3/6, 1 - x^2/2, 1 - x + x^2/2 - x^3/6, 1 + x/2 - x^2/8 + x^3/16, 1 + x/3 - x^2/9 + (5*x^3)/81}[[6]])/x, {x, 0, 1}] -x/9 + x^2/6 - C[1]/(3*E^(3*x)) + C[2]