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A247196
Number of tilings of a 5 X n rectangle using n pentominoes of shapes T, I, P.
3
1, 1, 3, 7, 17, 78, 199, 638, 1865, 5332, 17250, 50877, 156787, 475348, 1423432, 4367178, 13182353, 40122074, 121916294, 369052634, 1122475534, 3403574961, 10335095973, 31385295907, 95218937465, 289154182737, 877572289140, 2663965244527, 8087517963748
OFFSET
0,3
LINKS
Wikipedia, Pentomino
EXAMPLE
a(3) = 7:
._____. ._____. ._____. ._____. ._____. ._____. ._____.
|_. | | | | | | | | | | | | | | | | | | ._|
| |___| | | ._| | | | | | |_. | |_. | | | ._| | |___| |
| .___| | |_| | | | | | | | |_| | |_| | |_| | | |___. |
|_| | | | | | | | | | | | | | | | | | | |_|
|_____| |_|___| |_|_|_| |_|___| |___|_| |___|_| |_____| .
CROSSREFS
KEYWORD
nonn
AUTHOR
Alois P. Heinz, Nov 24 2014
STATUS
approved