Riddle: What number would come next?

1
11
21
1211
111221
312211
13112221
1113213211
31131211131221
Answer: 31131211131221.

Each line, excluding the first, describes the one before it.

1
11 <---describes 1st line, read as "one 1"
21 <---describes 2nd line, read as "two 1's"
1211 <---describes 3rd line, read as "one 2 two 1's"

etc...
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