Normally, n means a natural number, that means that n can be 1, 2, 3, 4...
So if they ask for the first 4 terms they would be:
f(1) = 3(1) -1 = 2
f(2) = 3(2) -1 = 5
f(3) = 3(3) -1 = 8
f(4) = 3(4) -1 = 11
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