Can you solve this riddle?

What's the pattern in this?
1 (line 1)
11 (line 2)
21 (line 3)
1211 (line 4)
111221 (line 5)
312211 (line 6)
13112221 (line 7)
1113213211 (line 8)
31131211131221 (line 9)

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