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It is: nth term = 5-4n and so the next term will be -19
This is the Fibonacci sequence, where the number is the sum of the two preceding numbers. The nth term is the (n-1)th term added to (n-2)th term
If you mean -1 3 7 11 15 then the nth term is 4n-5 and so the next term will be 19
The 'n'th term is [ 4 - 3n ].
3n(n+1] + 5 is the nth term