[newbie] making rows of table with discrete values for different number systems

[Jean Dupont]

I'm looking for an efficient method to produce rows of tables like this:

for base 2
0 0 0 0
0 0 0 1
0 0 1 0
0 0 1 1
0 1 0 0
.
.
.
1 1 1 1

for base 3
0 0 0 0 0 0
0 0 0 0 0 1
0 0 0 0 0 2
0 0 0 0 1 0
0 0 0 0 1 1
0 0 0 0 1 2
.
.
2 2 2 2 2 2

As you can see the rows are always twice the size of the base
I _don't_ need to have all rows available together in one array which would 
become too large for higher value number bases. It's sufficient to produce
one row after the other, as I will do further data manipulation on such a row
immediately.

If someone here could suggest best practices to perform this kind of operations,I'd really appreciate it very much

kind regards and thanks in advance
jean