A Riddle

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Given a sequence of natural numbers . Find it's N'th term. a1=3, a2=9, a3=30, a4=101, a5=358, a6=1443... ...,aN Input Single line containing a natural number N Output Print N'th term of the sequence modulo 10^9+7. Constraints - 1 N 100 Example Input: 5 Output: 358

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solution.cppC++17

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