OFFSET
0,3
LINKS
Alois P. Heinz, Table of n, a(n) for n = 0..1000
Wikipedia, Pentomino
EXAMPLE
a(4) = 17:
._______. ._______. ._______. ._______.
|_____. | | ._____| | | | | | | | ._| |
| | ._|_| |_| ._. | | | | | | | | | | |
| | |_. | | |_| |_| | | | | | | | | | |
| |___| | |_____| | | | | | | | |_| | |
|___|___| (4) |_______| (2) |_|_|_|_| (1) |_|___|_| (2)
._______. ._______. ._______.
| ._| | | | ._| ._| | ._|_. |
| | | | | | | | | | | | | | |
| | | | | | | | | | | | | | |
|_| | | | |_| |_| | |_| | |_|
|___|_|_| (4) |___|___| (2) |___|___| (2) .
CROSSREFS
KEYWORD
nonn
AUTHOR
Alois P. Heinz, Dec 07 2014
STATUS
approved