vsota
4 + (1/(2*n^2) - 1/(2*n))/1024 + (1/(6*n^3) - 1/(2*n^2) + 1/(3*n))/65536 + 
 1/(16*n)
-29/36
(-1 - 6*x)/36 + C[1]/E^(3*x) + E^(2*x)*C[2]