Double-extrapolation

What is element a 2014 a_{2014} of the sequence a 0 = 1 , a 1 = 11 , a 2 = 21 , a 3 = 1211 , a 4 = 1231 , a 5 = 131221 ? a_0=1, \quad a_1=11,\quad a_2= 21,\quad a_3= 1211, \quad a_4=1231, \quad a_5=131221?

(Source: Folklore)


The answer is 14233221.

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