insomniac brainteaser

What is the next element in this sequence

1
11
21
1211
111221
312211
?
23:46 Fri 11th May 2012
 
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1 to 6 of 6

131122211?
Question Author
not quite unless you have mistyped something.
Sorry forget the last '1'
Question Author
OK
explanation?
This is 'easier' to do than to explain!
In the last given number there are:

One No3, then one No1, then two No2 then two No1, so write the numbers as written
13 11 22 21

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