I need to define a recurrence relation and then take a pade approximation. This is the code f[0] = 1; f[z_, n_] := z^(1/2)*Sum[f[n] z^(-5 n/2), {n, 0, Infinity}]; PadeApproximant[f[z], {z, 10, {50, 50}}] Mathematica does not process this code. It shows Running… What went wrong here? Thank you.Read more