Symmetries of plane partitions
Journal of Combinatorial Theory Series A
American Mathematical Monthly
Symmetries of plane partitions and the permanent-determinant method
Journal of Combinatorial Theory Series A
Enumeration of perfect matchings in graphs with reflective symmetry
Journal of Combinatorial Theory Series A
Enumeration of Lozenge tilings of punctured hexagons
Journal of Combinatorial Theory Series A
The number of centered Lozenge tilings of a symmetric hexagon
Journal of Combinatorial Theory Series A
Concrete Math
Perfect Matchings and Perfect Powers
Journal of Algebraic Combinatorics: An International Journal
Proof of two conjectures of Zuber on fully packed loop configurations
Journal of Combinatorial Theory Series A
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Motivated by the enumeration of a class of plane partitions studied by Proctor and by considerations about symmetry classes of plane partitions, we consider the problem of enumerating lozenge tilings of a hexagon with "maximal staircases" removed from some of its vertices. The case of one vertex corresponds to Proctor's problem. For two vertices there are several cases to consider, and most of them lead to nice enumeration formulas. For three or more vertices there do not seem to exist nice product formulas in general, but in one special situation a lot of factorization occurs, and we pose the problem of finding a formula for the number of tilings in this case.