Easy Series

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Chef is interested to solve series problems. Chef wants to solve a series problem but he can't solve it till now.Can you help Chef to solve the series problem? - In series problem, the series goes as follows 1,9,31,73,141 . . . . . . . . Your task is to find the Nth term of series. For larger value of $N$ answer becomes very large, So your output should be performed $N$th term modulo 1000

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solution.cppC++17

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