Enumerating Tatami Mat Arrangements of Square Grids

  • Alejandro Erickson
  • Mark Schurch
Part of the Lecture Notes in Computer Science book series (LNCS, volume 7056)


We prove that the number of monomer-dimer tilings of an n×n square grid, with m < n monomers in which no four tiles meet at any point is m2m + (m + 1)2m + 1, when m and n have the same parity. In addition, we present a new proof of the result that there are n2n − 1 such tilings with n monomers, which divides the tilings into n classes of size 2n − 1. The sum of these over all m ≤ n has the closed form 2n − 1(3n − 4) + 2 and, curiously, this is equal to the sum of the squares of all parts in all compositions of n.


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Copyright information

© Springer-Verlag Berlin Heidelberg 2011

Authors and Affiliations

  • Alejandro Erickson
    • 1
  • Mark Schurch
    • 2
  1. 1.Department of Computer ScienceUniversity of VictoriaCanada
  2. 2.Mathematics and StatisticsUniversity of VictoriaCanada

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