# Category:Fibonacci Numbers

The Fibonacci numbers are a sequence $\sequence {F_n}$ of integers which is formally defined recursively as:
$F_n = \begin {cases} 0 & : n = 0 \\ 1 & : n = 1 \\ F_{n - 1} + F_{n - 2} & : \text {otherwise} \end {cases}$
for all $n \in \Z_{\ge 0}$.