The OEIS is supported by the many generous donors to the OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A219972 Number of tilings of an 8 X n rectangle using straight (3 X 1) trominoes and 2 X 2 tiles. 2
 1, 0, 4, 19, 70, 456, 2530, 12343, 66653, 372429, 1910822, 10162059, 55583124, 291195073, 1550518247, 8363883923, 44269140576, 235940940726, 1264437357202, 6723179849519, 35846240541026, 191571690239220, 1020536749613565, 5442225134864810, 29051213879574079 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,3 LINKS Alois P. Heinz, Table of n, a(n) for n = 0..100 EXAMPLE a(2) = 4, because there are 4 tilings of an 8 X 2 rectangle using straight (3 X 1) trominoes and 2 X 2 tiles: .___. .___. .___. .___. | | | | | | | | | | |___| |___| | | | | | | | | | | | |_|_| |_|_| |___| | | | | | | | | | | |_|_| |___| | | | |___| | | | | | | |_|_| | | | | | | | | | | |___| |_|_| |_|_| |___| CROSSREFS Column k=8 of A219967. Sequence in context: A129019 A167247 A267192 * A284224 A268214 A027208 Adjacent sequences: A219969 A219970 A219971 * A219973 A219974 A219975 KEYWORD nonn AUTHOR Alois P. Heinz, Dec 02 2012 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified February 26 17:57 EST 2024. Contains 370352 sequences. (Running on oeis4.)