It is: -6n+22
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The Nth term in the series is [ 2N ] .
If you mean: 2 4 8 16 32 64 it is 2^nth term and so the next number is 128
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2n
By varying the parameters of a quartic polynomial, the nth term can be made whatever you like. But, taking the simplest solution, Un = 2 - 4n for