Mystery sequence

I felt like trying something out, the result is the following number sequence.
Can you guess what it represents? I also created a file with the 2000 first values.

1 2 3 2 1 2 3 4 2 1 2 3 4 3 2 3 4 5 3
2 3 4 5 4 3 4 5 6 4 3 4 5 6 5 4 5 6 7 5
2 3 4 5 4 3 4 5 6 4 1 2 3 4 3 2 3 4 5 3
2 3 4 5 4 3 4 5 6 4 3 4 5 6 5 4 5 6 7 5
4 5 6 7 6 5 6 7 8 6 2 3 4 5 4 3 4 5 6 4
1 2 3 4 3 2 3 4 5 3 2 3 4 5 4 3 4 5 6 4
3 4 5 6 5 4 5 6 7 5 4 5 6 7 6 5 6 7 8 6
3 4 5 6 5 4 5 6 7 5 2 3 4 5 4 3 4 5 6 4
3 4 5 6 5 4 5 6 7 5 4 5 6 7 6 5 6 7 8 6
5 6 7 8 7 6 7 8 9 7 3 4 5 6 5 4 5 6 7 5
2 3 4 5 4 3 4 5 6 4 3 4 5 6 5 4 5 6 7 5
4 5 6 7 6 5 6 7 8 6 5 6 7 8 7 6 7 8 9 7
4 5 6 7 6 5 6 7 8 6 3 4 5 6 5 4 5 6 7 5
4 5 6 7 6 5 6 7 8 6 5 6 7 8 7 6 7 8 9 7
6 7 8 9 8 7 8 9 10 8 4 5 6 7 6 5 6 7 8 6
3 4 5 6 5 4 5 6 7 5 4 5 6 7 6 5 6 7 8 6
5 6 7 8 7 6 7 8 9 7 6 7 8 9 8 7 8 9 10 8
5 6 7 8 7 6 7 8 9 7 4 5 6 7 6 5 6 7 8 6
5 6 7 8 7 6 7 8 9 7 6 7 8 9 8 7 8 9 10 8
7 8 9 10 9 8 9 10 11 9 5 6 7 8 7 6 7 8 9 7

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