Enumeration of Hybrid Domino-Lozenge Tilings II: Quasi-Octagonal Regions
Enumeration of Hybrid Domino-Lozenge Tilings II: Quasi-Octagonal Regions
We use the subgraph replacement method to prove a simple product formula for the tilings of an 8-vertex counterpart of Propp's quasi-hexagons (Problem 16 in New Perspectives in Geometric Combinatorics, Cambridge University Press, 1999), called quasi-octagon.