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It could be

Un = (-3n4 + 30n3 - 105n2 + 168n - 80)/2

or

Un = (-5n4 + 50n3 - 175n2 + 286n - 136)/4

or any one of infinitely more polynomials of order >1, or other types of functions.

The simplest polynomial solution is Un = 9n - 4

or any

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11y ago

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