subfactorial Definition
the number of permutations of n objects in which no object appears in its natural place.
Using subfactorial: Examples
Take a moment to familiarize yourself with how "subfactorial" can be used in various situations through the following examples!
Example
The subfactorial of 4 is 9.
Example
The subfactorial of 5 is 44.
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Summary: subfactorial in Brief
The term 'subfactorial' [sʌbfækˈtɔːrɪəl] refers to the number of permutations of n objects in which no object appears in its natural place. It is also known as the derangement number.
