I gather that future value of ordinary annuity with continuous compounding of interest is calculated as

FV = PMT [e^rt -1]/[e^r-1]

So to find future value of an annuity due with continuous compounding of interest I would multiply the former by an extra interest factor of e^r thus making the formula as

FV = PMT e^r [e^rt -1]/[e^r-1]

Is this correct, the reason I think this may work is since for discrete compounding of interest we multiply the interest factor of (1+i) to the future value of annuity formula as

FV = PMT (1+i) [(1+i)^n - 1]/i

Just a confirmation of the correctness of the formula will suffice