Un = (-1)n*(2n - 1)
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If you mean -1 3 7 11 15 then the nth term is 4n-5 and so the next term will be 19
It is: nth term = 5-4n and so the next term will be -19
The nth term is: 5-2n
One of the infinitely many possible rules for the nth term of the sequence is t(n) = 4n - 1
If you mean: 15 11 7 3 then the nth term is 19-4n