The concept is that it is a count of something that increases by the amount that it used to be. Each _iteration_, or step in the sequence, is the most recent number plus the one before it. So you can start it with the most simple numbers, 1 as the first “recent” number, and 0 as the “previous” number, and iterating that rule gives you as much of the sequence as you want to generate.
Curious people looked at the sequence and noticed interesting things about it. For example, that the longer it goes, the closer the value of “recent” ÷ “previous” gets to about 1.618, and that natural processes have sequences that have the same kind of traits.
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