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xn = xn-1 - (n + 2).
3n(n+1] + 5 is the nth term
The Nth term in the series is [ 2N ] .
They are: nth term = 6n-4 and the 14th term is 80
If you mean: 2 4 8 16 32 64 it is 2^nth term and so the next number is 128