Involutions

The self-inverse permutations of (only fixed points and 2-cycles).

WikipediaInvolution (mathematics)↗MathWorldPermutationInvolution↗Involution↗WikidataQ846862↗OEISA000085✓↗SymPygenerate_involutions↗

Involutions(n)the self-inverse permutations of elements

Domain: Combinatorial collections

Details

• Count satisfies
• A sub-family of SymmetricGroup

Examples

See also: SymmetricGroup, Derangements