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 A219874 Number of tilings of an n X n square using dominoes and straight (3 X 1) trominoes. 5
 1, 0, 2, 14, 184, 9612, 1143834, 354859954, 295743829064, 631206895803116, 3541054185616706122, 51821077154605344550820, 1976225122734369352127065686 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,3 LINKS Table of n, a(n) for n=0..12. EXAMPLE a(3) = 14, because there are 14 tilings of a 3 X 3 square using dominoes and straight (3 X 1) trominoes: ._____. ._____. ._____. ._____. .___._. .___._. .___._. | | | | | | | | | |___| | |___| | | | | |___| | |___| | | | | | | |_|_| | |___| | | | | |_|_| | |___| | | | | | |_|_|_| |_|___| |_|___| |_|_|_| |___|_| |___|_| |_|_|_| ._____. ._____. ._____. ._____. ._____. ._____. ._____. |_____| |_____| |_____| |_____| | |___| | | | | |___| | |_____| | |___| | | | | |___| | |_|___| |_|_|_| |___|_| |_____| |_|___| |_|_|_| |___|_| |_____| |_____| |_____| . CROSSREFS Main diagonal of A219866. Cf. A233807, A364504. Sequence in context: A191236 A217905 A237852 * A074655 A268005 A158102 Adjacent sequences: A219871 A219872 A219873 * A219875 A219876 A219877 KEYWORD nonn,more AUTHOR Alois P. Heinz, Nov 30 2012 EXTENSIONS a(12) from Alois P. Heinz, Sep 30 2014 STATUS approved

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Last modified February 22 16:01 EST 2024. Contains 370256 sequences. (Running on oeis4.)