OFFSET
0,3
LINKS
Alois P. Heinz, Table of n, a(n) for n = 0..1000
Alois P. Heinz, G.f. and Maple program for A247443
Wikipedia, Pentomino
FORMULA
G.f.: see link.
EXAMPLE
a(5) = 16:
._._______. ._______._.
| | ._____| |_. .___| |
| |_| ._| | | |_| ._| |
| |_. |_. | | |_. |_. |
|___|_| | | | ._|_| |_|
|_______|_| (*8) |_|_______| (*8) .
MAPLE
# Maple program: see link.
CROSSREFS
KEYWORD
nonn
AUTHOR
Alois P. Heinz, Sep 23 2014
STATUS
approved