There is a nice formula, called the Plemelj-Smithies formula that allows the computation of the determinant of certain operators in terms of the moments (Tr(A^n)) of A. I'm including this as an answer because the formula organizes the information nicely for all finite dimensions, and holds also in infinite dimensions.
For the formula, see section 1.2 of the paper here. This is a paper by
Gohberg, Goldberg and Krupnik thatKrupnik Traces and Determinants of Linear Operators, Integral Equations and Operator Theory 1996, Volume 26, Issue 2, pp 136-187.
This paper was eventually they extended into a very nice book.
Later on, I'll try to come back and type in the formula...