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There are infinitely many possible answers because there are infinitely many polynomials of order 6 (or higher) that will give these as the first six numbers and any one of these could be "the" rule. Short of reading the mind of the person who posed the question, there is no way of determining which of the infinitely many solutions is the "correct" one.

The simplest solution, however, is possibly the following:

U(n) = x^2 + 3*x - 2 for n = 1 ,2, 3, ...

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10y ago

What else can I help you with?