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The Number of Convex Polyominoes with Given Height and Width

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arxiv 1903.01095 v1 pith:SU3WA4KP submitted 2019-03-04 math.CO

The Number of Convex Polyominoes with Given Height and Width

classification math.CO
keywords polyominoesgivennumberconvexenclosingpointsrectanglecalculate
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We give a new combinatorial proof for the number of convex polyominoes whose minimum enclosing rectangle has given dimensions. We also count the subclass of these polyominoes that contain the lower left corner of the enclosing rectangle (directed polyominoes). We indicate how to sample random polyominoes in these classes. As a side result, we calculate the first and second moments of the number of common points of two monotone lattice paths between two given points.

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