This is a sequence defined through a formula type of u(n+1) = f[u(n)] where f refers to a complex function already defined.
Such a sequence u is defined via menu Calculus - New complex calculus - Complex u(n+1) = f[u(n)] sequence.
A dialog box pops up.
You are asked for :
The indexes of the sequence start to zero.
When a sequence named u has been created, you can refer to term of index n of the sequence in a calculus as u(n). This term will exist only if n is in the range from 0 to N - 1, where N is the number of terms of the sequence (assuming the term exist).
See also : The recurrent sequence graph.
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