Enumeration of Coronas for Lozenge Tilings
Craig Knecht
Harris Lane
Gallatin, TN 37066
USA
Feihu Liu and Guoce Xin
School of Mathematical Sciences
Capital Normal University
Beijing, 100048
China
Abstract:
We study the enumeration of coronas. This counting problem concerns two
specific types of lozenge tilings. Exact closed-form formulas for these
were conjectured in sequences
A380346
and
A380416 of
the OEIS. We prove these conjectures by employing the weighted adjacency
matrix. Furthermore, we extend these results to a general setting.
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(Concerned with sequences
A380346
A380416.)
Received November 19 2025;
revised versions received December 3 2025; December 5 2025.
Published in Journal of Integer Sequences,
December 5 2025.
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