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It is: -6n+22
The nth term is equal to 4n.
The Nth term in the series is [ 2N ] .
Clearly, if you omit the sign, the nth. term will be 4n. The alternating sign can easily be expressed as a power of (-1), so in summary, the nth. term is (-1)n4n.
If you mean: 2 4 8 16 32 64 it is 2^nth term and so the next number is 128