It is 214.
The rule used is Un = (23n3 - 132n2 + 238n - 123)/3 for n = 1, 2, 3, ...
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(1) Take the difference of the two previous numbers in sequence (2) Add 4 to this difference. (3) Take the number from step #2 and add it to the previous number in the sequence. For example, to find the next number in the sequence: (1) 121 - 90 = 31 (2) 31 + 4 = 35 (3) 121 + 35 = 156
64
6
Each subsequent number in this sequence is 2 less than the previous. It is extremely likely that the next number in this sequence is 2.
20