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Summing polynomials

I have a ┬┤Univariate Polynomial Ring in t over Symbolic Ring┬┤

sage: cj_t = (-1)**(j-1)/factorial(j-1)*(-j+a)**(j-1/2)*exp(-j)*(t+j)**(-1)

How can I compute the sum over j from 1 to N?

sage: sum(cj_t,1,N)

doesn't work.

sage: sum([cj_t for j in [1..N]])

(Python syntax) doesn't work either.