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COMMENTS
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a(n) = a(0) * product(i=1,2,...k)r(i)^C(n,i), C(n,i)=0 for all i > n.
Here, it is submitted a special case of the geometric-geometric sequence having finite ratios, that is, k consecutive rows of ratios, whose first terms are r(1), r(2), r(3),..., r(k), the last row (k-th row) being of a constant ratio, with k=3, a(0)=r(1)=r(2)=r(3)=3.
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