Harry And N-th Number

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Harry is an engineering student, he is a maths lover, specially fond of series expansions. He has recently studied series like Fibonacci, AGP etc. So, his teacher gave him a task to calculate the Nth number of a special series derived by the teacher herself. Harry is busy doing his college assignments, so he seeks for your help. You need to help him in order to find the Nth number of that series

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solution.cppC++17

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