I also get for:

perl -E'print$_^$_/2for 0..pop' 15

Output:

0132675412131514101198

But for:

perl -E'say$_^$_/2for 0..pop' 15

I get: 

0
1
3
2
6
7
5
4
12
13
15
14
10
11
9
8

[download]

I believe that was mtve's intent. Um, that's 20 chars of actual code.

In reply to Re^2: Decimal Gray Code in 31 chars by Xiong
in thread Decimal Gray Code in 31 chars by Oromis92

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