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

Using Python:

Write a functionPellwhich on input a non-negative integerireturns thei-th Pell numberP_iand does not use recursion Write a functionPell_rec which on input a non-negative integer i returns the i-th Pell number P_iand does use recursion. Please Help !

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