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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It is: 9n+5 and so the next term is 50
5+9n
[ 6n + 8 ] is.
The nth term is (36 - 4n)
8 + (74 x 6) = 75th term. nth term = 8 + 6(n-1)