2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/59808We determine the number of nonequivalent chord diagrams of order $n$ under the action of two groups, $C_{2n}$, a cyclic group of order $2n$, and $D_{2n}$, a dihedral group of order $4n$. Asymptotic formulas are also established.10 pages, Latex, uses PSTricksCombinatoricsQuantum Algebra05A15; 05C25text