  Using Numerical Stochastic Perturbation Theory (NSPT), we calculate the
static self-energy of SU(3) gauge theory up to order \alpha^{20}. Simulations
on a large set of different lattice volumes allow for a careful treatment of
finite size effects. The resulting infinite volume perturbative series of the
static self-energy is in remarkable agreement with the predicted asymptotic
behaviour of high order expansions, namely with a factorial growth of
perturbative coefficients known as renormalon.
