It is probably 2n.
But there are infinitely many polynomials of degree 5, as well as other mathematical functions, that will fit the above 4 points.
For example, one possibility for the nth term is
Un = (n4 - 10n3 + 35n2 - 42n - 24)/4
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The nth term is (2n - 12).
If you mean: 3, 4, 5, 6 and 7 then nth term = n+2
It is: nth term = -4n+14
The nth term is 2n So the 20th term is 2 x 20 = 40.
1 2 3 4= n 2 4 6 8 plusing two = 2n answer 2n