This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A192093 #18 Jan 01 2023 09:47:18 %S A192093 1,21,357,406,490,584,827,1090,1914,3262,6228,10226,17114,25534,41034, %T A192093 61778,102644,163334,278554,446898,747274,1175494,1926612,3021594, %U A192093 4960170,7880334,13028058,20841466,34355316,54835150,89785130 %N A192093 Number of tatami tilings of a 7 X n grid (with monomers allowed). %C A192093 A tatami tiling consists of dimers (1 X 2) and monomers (1 X 1) where no four meet at a point. %H A192093 A. Erickson, F. Ruskey, M. Schurch and J. Woodcock, <a href="https://doi.org/10.37236/596">Monomer-Dimer Tatami Tilings of Rectangular Regions</a>, Electronic Journal of Combinatorics, 18(1) (2011) P109, 24 pages. %e A192093 Here are some tatami tilings of the 7 X 3 grid: %e A192093 _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ %e A192093 |_ _| |_| |_| | |_| |_|_ _| |_| | |_ _| |_| |_| |_| | |_ _| |_| %e A192093 |_ _|_| |_| |_| | |_|_ _| |_| | |_| |_|_| |_| | | |_|_| |_|_| | %e A192093 |_|_ _|_|_|_|_| |_|_ _|_|_|_|_| |_|_|_ _|_|_|_| |_|_ _|_|_ _|_| %Y A192093 Cf. A192092, A192094. %K A192093 nonn %O A192093 0,2 %A A192093 _Frank Ruskey_ and Yuji Yamauchi (eugene.uti(AT)gmail.com), Jul 14 2011