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Number of Derangements
## Formula
$$!0=1$$
$$!1=0$$
$$!2=1$$
$$!3=2$$
$$!4=9$$
## Approximation
$$!n\approx\frac{n!}{e}$$
## Usage
- Used for quick evaluation or approximation of derangement counts.
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Number of Derangements
## Formula
$$!0=1$$
$$!1=0$$
$$!2=1$$
$$!3=2$$
$$!4=9$$
## Approximation
$$!n\approx\frac{n!}{e}$$
## Usage
- Used for quick evaluation or approximation of derangement counts.
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