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From module Functional Equations (Intro)
A function fff is defined recursively by f(1)=f(2)=1f(1) = f(2) = 1f(1)=f(2)=1 and f(n)=f(n−1)−f(n−2)+nf(n) = f(n-1) - f(n-2) + nf(n)=f(n−1)−f(n−2)+n for all integers n≥3n \geq 3n≥3. What is f(2018)f(2018)f(2018)?
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