Hi, Going up $line: 
for my $i (2..3) {
    for my $line (0..4**$i) {

[download]
Would like to report (for level $i=2, 16 lines)
line 0 - 0,0
line 1 - 0,1
line 2 - 0,2
line 3 - 0,3
line 4 - 1,0
line 5 - 1,1 (...) line 15 - 3,3

for level ($i=3, 64 lines)
line 0 - 0,0,0
line 1 - 0,0,1
line 2 - 0,0,2
line 3 - 0,0,3
line 4 - 0,1,0 (...) line 63 - 3,3,3

And so on for larger $i.
Thanks, best.

In reply to Incremental indexing exponential by FFRANK

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