login
A247443
Number of tilings of a 5 X n rectangle using n pentominoes of shapes F, L, Y.
10
1, 0, 2, 0, 6, 16, 32, 104, 186, 800, 1700, 4836, 11186, 29940, 84388, 208808, 563364, 1391664, 3787510, 9824684, 25712276, 66815444, 173151378, 457266220, 1188536784, 3113743272, 8087358736, 21152284376, 55283003950, 144314582896, 376852311434, 982507243820
OFFSET
0,3
LINKS
FORMULA
G.f.: see link.
EXAMPLE
a(5) = 16:
._._______. ._______._.
| | ._____| |_. .___| |
| |_| ._| | | |_| ._| |
| |_. |_. | | |_. |_. |
|___|_| | | | ._|_| |_|
|_______|_| (*8) |_|_______| (*8) .
MAPLE
# Maple program: see link.
KEYWORD
nonn
AUTHOR
Alois P. Heinz, Sep 23 2014
STATUS
approved