recursion - python 3.4 recursive formula for an infinity series -

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here's formula want implement:

given x, y, define x+x^y , continue: ... + (x**x**y)

that is: next term exponent of 2 anterior terms piling up.

so get:

x + [x**y] + [x**(x**y)] + [x**y]**[x**(x**y)] + ...


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