If you mean -1 3 7 11 15 then the nth term is 4n-5 and so the next term will be 19
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It is: nth term = 5-4n and so the next term will be -19
(2n-1)(-1)n
The given sequence is 11, 31, 51, 72 The nth term of this sequence can be expressed as an = 11 + (n - 1) × 20 Therefore, the nth term is 11 + (n - 1) × 20, where n is the position of the term in the sequence.
The simplest, out of infinitely many possible answers, is the linear polynomial,U(n) = 4n - 1 for n = 1, 2, 3, ...
3n-2