Abstract
We give the generating function for parallelogram polyominoes according to the bond perimeter and the site perimeter. In this last case, we give an asymptotic evaluation for their number. According to the two parameters an exact formula for their number is found which gives some numbers closed to the Narayana's numbers.
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Delest, M.P., Gouyou-Beauchamps, D. & Vauquelin, B. Enumeration of parallelogram polyominoes with given bond and site perimeter. Graphs and Combinatorics 3, 325–339 (1987). https://doi.org/10.1007/BF01788555
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DOI: https://doi.org/10.1007/BF01788555