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tokens: Acknowledgments The author is indebted to Sverre Aarseth of the Institute of Astronomy, Cambridge, for his continuous efforts in improving nbody6/7 , without which this study would not have been possible. SB is thankful to Jarrod Hurley of the Swinburne University of Technology for reviewing the changes made in the BSE s routines for this work, testing them independently, and also for interesting discussions. SB is thankful to Chris Belczynski of the Astronomical Observatory, University of Warsaw, for supplying the data corresponding to the ZAMS massremnant mass relations, as obtained from the StarTrack program (Fig. 1 ), and also for useful discussions. SB is thankful to the anonymous referee for helpful comments that improved some of the descriptions of the paper. Finally, but not the least, SB is indebted to the computing team of the Argelander-Institut fr Astronomie, University of Bonn, for their support and efficient maintenance of the workstations on which all the computations have been performed.