OFFSET
1,2
COMMENTS
Equivalently: The number of strong rectangulations with n rectangles that avoid two windmill patterns.
LINKS
Andrei Asinowski, Jean Cardinal, Stefan Felsner, and Éric Fusy, Combinatorics of rectangulations: Old and new bijections, arXiv:2402.01483 [math.CO], 2024, page 37.
Arturo Merino and Torsten Mütze, Combinatorial generation via permutation languages. III. Rectangulations, Discrete Comput. Geom., 70(1):51-122, 2023. Page 99, Table 3, entry "12".
FORMULA
A 5-variate recurrence is given in the paper Asinowski, Cardinal, Felsner, and Fusy.
CROSSREFS
KEYWORD
nonn
AUTHOR
Andrei Asinowski, Sep 02 2024
STATUS
approved