In Python, A list may contain {0,1,2}, find the number of strings of size n that do not contain two 1's next to eachother. For example. there would be 8 lists of size 2 that are approved. and list size of 3 has 27  (3*3*3) possible but the lists of [X,1,1],[1,1,X],[1,1,1] are not accepted. the n(3) = (27 - 3) Any python pros have any idea for this tricky recursive problem

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