Any number of your choice. It is possible to find a quartic (order 4) polynomial that will fit the given 4 points and any other.
There is only one cubic that will do the trick:
Un = (-3n3 + 26n2 - 63n + 52)/2 for n = 1, 2, 3, ...
and according to it U5 = 6.
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24
32 The rule is to add 3n, where n is the number of the number in the series. (add 3, 6, 9, 12).
How about 3 followed by 12
It is: 17+6 = 23
In this series, the 1st, 3rd, and 5th numbers double as they progress, while the 2nd. 4th, and 6th number decrease by 4. That being the case, the next 2 numbers in the series would be 24, 4.