# Recursion 3

Let $$a_{0}=0$$, $$a_{1}=1$$ and $$a_{n}= n^{a_{n-1}}$$ where $$n\ge2$$ be a recursive function. Write a program that calculates the image value of any non-negative integer n.

Can you find $$a_{4}$$ mod $$2015$$ mod $$20$$ mod $$15+2000$$ ?

##### this problem is a part of the set Fundamental Programming
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