Callan, David, Vít Jelínek, and Toufik Mansour. “Inversion Sequences Avoiding a Triple of Patterns of 3 Letters”. The Electronic Journal of Combinatorics 30, no. 3 (August 11, 2023): P3.19. Accessed March 29, 2026. https://www.combinatorics.org/ojs/index.php/eljc/article/view/v30i3p19.