Window Editor Variables in Sequence Mode on TI83 Plus
The Window editor when the TI83 Plus graphing calculator is in Sequence mode offers the following list of variables you must set when graphing a sequence:

nMin: This setting contains the first value of the independent variable n. It must be set equal to 0 or a positive integer.
nMin appears both in the Window editor and in the Y= editor. If you change the value of nMin in either the Window editor or the Y= editor, the value of nMin will automatically be updated in both editors.

nMax: This setting contains the largest value of the independent variable n that you want the calculator to use to evaluate your sequences. For example, if nMin = 0 and nMax = 100, the calculator will evaluate the first 101 terms in each sequence.
nMax must be set equal to a positive integer that is greater than nMin. Be reasonable when entering a value for nMax. If you’re graphing three sequences and nMax = 1,000, it’s going to take the calculator at least a minute to get the job done.
If it’s taking a long time for the calculator to graph your sequences, and you start to regret that rather large value you placed in nMax, press [ON] to terminate the graphing process. You can then go back to the Window editor and adjust the nMax setting.

PlotStart: This setting tells the calculator where you want to start graphing in each sequence. For example, if PlotStart = 20, then the calculator starts the graph with the 20th term in each sequence.
This isn’t always intuitive. If nMin = 1, then the 20th term in the sequence u(n) is u(20). But if nMin = 0, then the 20th term in this sequence is u(19).

PlotStart must be set equal to a positive integer. Usually it’s set equal to 1 so that the graph starts at the beginning of a sequence.

PlotStep: This setting tells the calculator if you want to skip graphing any terms in each sequence. A setting of 1 tells the calculator to graph every term in each sequence; a setting of 2 tells it to graph every other term; and a setting of 3 tells it to graph every third term, and so on.
PlotStep must be set equal to a positive integer. Usually it’s set equal to 1 so that the graph shows all terms in your sequences.
You use the remaining items in the Window editor to set a viewing window for the graph.