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An Object Grammar for Column-Convex Polyominoes

Annals of Combinatorics, 2004
This articles shows an object grammar decomposition for the classes of column convex and directed column-convex polyominoes. The authors obtain the enumeration of these classes according to the semi-perimeter. In addition to that, they give an explanation of the algebraicity of the generating function for both classes.
Duchi E., RINALDI, SIMONE
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