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 A219871 Number of tilings of an 8 X n rectangle using dominoes and straight (3 X 1) trominoes. 2
 1, 4, 123, 5233, 161800, 6155230, 223026907, 8061851335, 295743829064, 10750194262698, 392127322268846, 14301080443962397, 521186161714401053, 19005127884701974465, 692863015545590519355, 25260000472133325186613, 920954865421382858310101 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 LINKS Alois P. Heinz, Table of n, a(n) for n = 0..200 EXAMPLE a(1) = 4, because there are 4 tilings of an 8 X 1 rectangle using dominoes and straight (3 X 1) trominoes: ._. ._. ._. ._. | | | | | | | | | | | | |_| |_| |_| |_| | | | | | | | | | | |_| | | |_| |_| | | |_| | | | | |_| | | | | | | | | |_| |_| |_| |_| CROSSREFS Column k=8 of A219866. Sequence in context: A268006 A144993 A064681 * A263550 A232592 A005936 Adjacent sequences: A219868 A219869 A219870 * A219872 A219873 A219874 KEYWORD nonn AUTHOR Alois P. Heinz, Nov 30 2012 STATUS approved

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Last modified November 29 07:03 EST 2023. Contains 367429 sequences. (Running on oeis4.)