Hi. I'm Paul from Romania. I joined this forum because i wanted to share my knowledge and learn from you all.

I have a small problem.

Is there any particular formula to find the general term of a recurrence relation?

I must find it for this one:

a_{1}=1

a_{2}=5

a_{n+2}=a_{n+1}+ 2a_{n}

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a_{n}=?