you must decide how the input variable is named: 'n', 'nx' or 'x'!! :-/
I cleaned things up a little.
Hard-coded solutions based on look-up tables for F_n or (F_n)², such as Solution 1506329, should be banned and failed by the Test Suite.
I do not undertand the problem. If you provide the fibonacci sequence, there is nothing to do.
Add two numbers
Sum the elements in either diagonal of a square matrix
Evaluating a polynomial
factorial of a number x
Convert a number to its Roman representation
Find the square of the sum of the digits of a number
Concatenate two strings
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