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If the sequence is non-linear, you need to establish how it is defined.
It is the sequence of first differences. If these are all the same (but not 0), then the original sequence is a linear arithmetic sequence. That is, a sequence whose nth term is of the form t(n) = an + b
There are infinitely many possible answers. The simplest, linear, rule is Un = 4n - 17 for n = 1, 2, 3, ...
"Non-linear sequence" is a generic term for just about ANY sequence, each of which will have a different equation.