Formulae for Growth Factors In Expanding Universes Containing Matter and   a Cosmological Constant
  Formulae are presented for the linear growth factor D/a and its logarithmic derivative dlnD/dlna in expanding Friedmann-Robertson-Walker Universes with arbitrary matter and vacuum densities. The formulae permit rapid and stable numerical evaluation. A fortran program is available at http://casa.colorado.edu/~ajsh/growl/ . 
A. J. S. Hamilton (JILA, U. Colorado)