May be a little off. Kinda stumped, but would it be 1312231, and if not, do I just have the second 3 in the wrong spot?

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What's the next logical value in this sequence:
1
11
21
1211
111221
312211
___________?
May be a little off. Kinda stumped, but would it be 1312231, and if not, do I just have the second 3 in the wrong spot?
Think of it this way, each line that follows the first line, just describes the line above it.
First line was "1"
second line says there's "one 1"
third line says there's "two one's"
ergo 13, 11, 22, 21
And before you say it....No, I don't have a life :-)
