What is the explanation for the Fibonacci sequence?

Answer 1

The Fibonacci sequence is defined as follows:f(1) = 1,

f(2) = 1 and

f(n) = f(n-1) + f(n-2) for all n >2.

The first two are the "seeds" and the third is the recursive formula which states that each term, after the second, is the sum of the two preceding terms.