This is a follow-up to Alecos Papadopoulos's posting at
https://www.mail-archive.com/gretl-users@gretlml.univpm.it/msg17000.html
Gretl's halton() function supports creation of m Halton sequences of
length r. Up till now m has been limited to 40, but that limit is now
removed in git. This change will appear in the gretl snapshots before
long.
Allin Cottrell