Here's my version: 
@a = (1);
for (1..10) {
  print "@a\n";
  @na=();
  for (@a) 
    { $na[-1] == $_ ? $na[-2]++ : push @na, (1, $_) }
  @a=@na;
}

[download]
It does not move elements around (assuming push/pop are doing the natural thing) and has only one temporary copy.

Update: Use [-1] instead of [$#na]. Cool, learned a new thing!
Update: use ?: instead of if/then

In reply to RE: Generating a Pattern by fundflow
in thread Generating a Pattern by japhy

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