Question: rsolve() recursive inhomogenous equation

I want to use maple to solve the following recursive inhomogenous equation:

Xn+2 - 5xn+1 6xn = 4n+1

I thought I could write like this:

 

 but it doesn't work. I get the error message

"Error, (in rsolve/single) equation false = 0 does not involve function F()"

How should I write in order to solve it?

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