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

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A219869 Number of tilings of a 6 X n rectangle using dominoes and straight (3 X 1) trominoes. 2
1, 2, 30, 472, 5624, 82634, 1143834, 15859323, 223026907, 3105936858, 43427618185, 606962113407, 8477372675760, 118475405895601, 1655302050975409, 23128348583334118, 323168394713538001, 4515400902297318144, 63091618970759626487, 881547198837947075202 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,2
LINKS
EXAMPLE
a(1) = 2, because there are 2 tilings of a 6 X 1 rectangle using dominoes and straight (3 X 1) trominoes:
._. ._.
| | | |
| | |_|
|_| | |
| | |_|
| | | |
|_| |_|
CROSSREFS
Column k=6 of A219866.
Sequence in context: A296980 A219706 A318477 * A072976 A143414 A099046
KEYWORD
nonn
AUTHOR
Alois P. Heinz, Nov 30 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.

License Agreements, Terms of Use, Privacy Policy. .

Last modified March 4 01:40 EST 2024. Contains 370522 sequences. (Running on oeis4.)