Given n and any number for the nth term, it is a simple matter to find a rule such that the above four numbers are the first four of a sequence and the given number in the nth position.
However, the simple answer for simple questions is Un = 4n
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The nth term is: 4n
Please note that (a) this is a sequence of square numbes, and (b) the sequence starts at 22.
The nth term is 2n2. (One way to find that is to notice at all the numbers are even, then divide them by 2. The sequence becomes 1, 4, 9, 16, 25, which are the square numbers in order.)
36 Seems like: 1 4 9 16 25 is squared sequence: 1 2 3 4 5 So 6 squared will be 36.
n2 + 3n - 2