n-tupel frequencies

[Dr. J. Lorenzen]

Dear netters,
I am trying to write some software for better primer design. I am seeking
information about the frequencies of hexameres and higher n-tupels in the
sequenced human genome. Does anyone know a public site where I can retrieve
this information? Do larger gene databases maintain such a table?
All suggestions welcome.
Dr. Johann Lorenzen
Department of Pathology
University of Cologne