OFFSET
0,3
LINKS
Alois P. Heinz, Table of n, a(n) for n = 0..50
EXAMPLE
a(2) = 5, because there are 5 tilings of a 9 X 2 rectangle using straight (3 X 1) trominoes and 2 X 2 tiles:
.___. .___. .___. .___. .___.
| | | | | | | | | | | |
| | | | | | |___| |___| |___|
|_|_| |_|_| | | | | | | |
| | | | | | | | |___| |___|
| | | |___| |_|_| | | | | |
|_|_| | | | | | | | |___|
| | | |___| |___| |_|_| | | |
| | | | | | | | | | | |
|_|_| |___| |___| |___| |_|_|
CROSSREFS
KEYWORD
nonn
AUTHOR
Alois P. Heinz, Dec 02 2012
STATUS
approved