That should be `M^(n-3)` for all n>3 where M is the base Matrix, because you already have the first 3 values of f(n).
Also, writing matrix F as:
|f(3)|
|f(2)|
|f(1)|
would be sequentially more consistent with the values of f(n) in F.

That should be `M^(n-3)` for all n>3 where M is the base Matrix, because you already have the first 3 values of f(n).
Also, writing matrix F as:
|f(3)|
|f(2)|
|f(1)|
would be more consistent with the values of f(n) in F.