KG-Sombor index of Kragujevac trees

The paper is concerned with the KG-Sombor index ( K G ), a recently introduced vertex-and-edge-degree-based version of the Sombor index, applied to Kragujevac trees ( K g ). A general combinatorial expression for K G ( K g ) is established. The species with minimum and maximum K G ( K g ) -values are determined.