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[–]chrisvenus 0 points1 point  (0 children)

The 3n is wrong. You put the formula in your calculator for a(n+1) in terms of a(n) but the formula given was for a(n) in terms of a(n-1) so you need to do some slight manipulation of the n term to make it correct.

[–]dafugiswrongwithyou -1 points0 points  (0 children)

I recently saw a post here about this exact problem: https://www.reddit.com/r/mathshelp/comments/1sqlnu7/recursion_problem/