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You provided the code of R2. So I use R2 to show how to define the n-th power of R2 recursively.

def R2(X): 
    return matrix(3,1,(-X[0,0],X[1,0],X[2,0]))

def R2_pow(X,n):
    if n <= 1:
        return R2(X)
        return R2(R2_pow(X,n-1))

M = matrix(3,1,(1,1,1))

L = [R2_pow(M,k) for k in [3..10]]
D = {k:R2_pow(M,k) for k in [3..10]}

L; D