Assuming this is a linear or arithmetic sequence,
the nth term is Un = 31 - 8n.
But, there are infinitely many polynomials of order 5 or higher, and many other functions that will fit the above 5 numbers.
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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
3n(n+1] + 5 is the nth term
t(n) = 6*n - 1 where n = 1, 2, 3, ...