Column-convex polyominoes were introduced in 1950's by Temperley, a mathematical physicist working on "lattice gases". By now, column-convex polyomin…

In most of today's exactly solved classes of polyominoes, either all members are convex (in some way), or all members are directed, or both. If the c…

Stacked directed animals and multi-directed animals are two lattice models defined by Bousquet-M\'{e}lou and Rechnitzer in 2002. The original definit…

Column-convex polyominoes are by now a well-explored model. So far, however, no attention has been given to polyominoes whose columns can have either…

Column-convex polygons were first counted by area several decades ago, and the result was found to be a simple, rational, generating function. In thi…

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