OFFSET
0,3
LINKS
Alois P. Heinz, Table of n, a(n) for n = 0..16
Wikipedia, Polyomino
FORMULA
a(n) = A353963(n,n).
EXAMPLE
a(2) = 6:
.___. .___. .___. .___. .___. .___.
| |_| | ._| |_. | |_| | |_|_| | |
|___| |_|_| |_|_| |___| |_|_| |___| .
CROSSREFS
KEYWORD
nonn
AUTHOR
Alois P. Heinz, May 16 2022
STATUS
approved