You can
put this solution on YOUR website! .
You really need to learn on how to correctly write the formulas when you posting to this forum.
I am 129% sure that your formula should be written as
a[n] = 6n - 17 (presenting
= 6n-17).
If it is so, then re-write your text and re-post.
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(I don't want to built my solutions on my suggestions: I want to built it based on your post, correctly presented by you).