F n ! = F n ⋅ F n − 1 ⋅ F n − 2 ⋅ . . . F 3 ⋅ F 2 ⋅ F 1 ⋅ {\displaystyle F_{n}!=F_{n}\cdot F_{n-1}\cdot F_{n-2}\cdot ...F_{3}\cdot F_{2}\cdot F_{1}\cdot }
F 0 ! = 1 {\displaystyle F_{0}!=1\ }
( n k ) F = F n ! F k ! ⋅ F n − k ! {\displaystyle {n \choose k}_{F}={\frac {F_{n}!}{F_{k}!\cdot F_{n-k}!}}}
( n 0 ) F = 1 {\displaystyle {n \choose 0}_{F}=1}