By varying the parameters of a quartic polynomial, the nth term can be made whatever you like.
But, taking the simplest solution,
Un = 2 - 4n for
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They are: nth term = 6n-4 and the 14th term is 80
It is: 26-6n
3n-2
t(n) = (-5n4 + 62n3 - 247n2 + 334n - 36)/6
It is: -6n+22