Question: Write a function Pell which on input a non-negative integer i returns the i -th Pell number P i and does not use recursion. a

Write

a function Pell which on input a non-negative integer i returns the i-th Pell number Pi and does not use recursion.

a function Pell_rec which on input a non-negative integer i returns the i-th Pell number Pi and does use recursion.(Python)

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