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Fibonorial

Fibonorial

In mathematics, the Fibonorial n!F, also called the Fibonacci factorial, where n is a nonnegative integer, is defined as the product of the first n positive Fibonacci numbers, i.e. {\displaystyle {n!}_{F}:=\prod _{i=1}^{n}F_{i}, \quad n\geq 0, }... Wikipedia