OFFSET
0,5
LINKS
Alois P. Heinz, Table of n, a(n) for n = 0..500
Wikipedia, Pentomino
EXAMPLE
a(3) = 1:
._____.
| ._. |
|_| |_|
|_. ._|
| |_| |
|_____| .
CROSSREFS
KEYWORD
nonn
AUTHOR
Alois P. Heinz, Sep 24 2014
STATUS
approved