Fibanocci sequence? what is it

The Fibonacci Sequence is the series of numbers:

0, 1, 1, 2, 3, 5, 8, 13, 21, 34, ...

The next number is found by adding up the two numbers before it.

The Fibonacci sequence is a string of numbers whose progression is as follows:

1, 1, 2, 3, 5, 8, 13, 21...

Each number is determined by adding the two numbers that came before it. So the next number would be 13 + 21 = 34, and so on.

The first two terms are both 1. Then the rest of the terms are teh sum of the previous 2 terms

That is
F(1) = 1
F(2) = 1
F(3) = F(1)+F(2) = 1+1=2
F(4) = F(3) + F(2) = 2+1 = 3
.
.
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I hope this helps