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 A192091 Number of tatami tilings of a 5 X n grid (with monomers allowed). 3
 1, 8, 68, 90, 126, 178, 325, 584, 1165, 2030, 3619, 6080, 10987, 19362, 35477, 62360, 111837, 195614, 350707, 619568, 1112315, 1967090, 3514597, 6214984, 11093549, 19664558, 35090115, 62247552, 110934699, 196859394, 350650261 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 COMMENTS A tatami tiling consists of dimers (1 X 2) and monomers (1 X 1) where no four meet at a point. LINKS Table of n, a(n) for n=0..30. A. Erickson, F. Ruskey, M. Schurch and J. Woodcock, Monomer-Dimer Tatami Tilings of Rectangular Regions, Electronic Journal of Combinatorics, 18(1) (2011) P109, 24 pages. EXAMPLE Here are some tatami tilings of the 5 X 3 grid: _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ |_ _| |_| | |_| |_|_ _| | |_ _| |_| |_| | |_ _| |_ _|_| |_| | |_|_ _| | |_| |_|_| | | |_|_| | | |_|_ _|_|_| |_|_ _|_|_| |_|_|_ _|_| |_|_ _|_|_| CROSSREFS Cf. A192090, A192092, A033508 (without tatami condition). Row sums of A272474. Sequence in context: A000434 A304073 A250258 * A050841 A208947 A296670 Adjacent sequences: A192088 A192089 A192090 * A192092 A192093 A192094 KEYWORD nonn AUTHOR Frank Ruskey and Yuji Yamauchi (eugene.uti(AT)gmail.com), Jul 07 2011 STATUS approved

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Last modified June 4 12:12 EDT 2023. Contains 363128 sequences. (Running on oeis4.)