This isn't so much a difficult thing to do, but I was writing it up as part of a homework assignment and thought it was a nice, elegant formulation. Naturally, I'm hoping that my fellow monks will be able to improve on it. :-)
sub gen_seqs
{
  my ($n) = @_;

  my @seqs = ();

  if($n == 1) {
    $seqs[0] = [0];
    $seqs[1] = [1];
  } else {
    my @seqs_0 = &gen_seqs($n-1);
    for my $seq (@seqs_0) {
      unshift @$seq, 0;
    }
    my @seqs_1 = &gen_seqs($n-1);
    for my $seq (@seqs_1) {
      unshift @$seq, 1;
    }
    push @seqs, @seqs_0, @seqs_1;
  }
  return @seqs;
}

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In reply to Generate all (0,1)-sequences in lexicographic order by FoxtrotUniform

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