Data Table Help

I

IHateComputers

Everytime I try to do a data table, I get a message that says: "Error. Input
cell reference not valid."

I do not know what I am doing wrong. Here are my steps:

1. Enter titles.
2. Link initial numbers
3. Put in a series of numbers to test
4. Select on the numbers and try to complete the data table.

However, there is always some sort of error message coming up. How do I fix
this?
 
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