OFFSET
1,6
COMMENTS
The two reflective symmetries imply 180-degree (but not 90-degree) rotational symmetry.
LINKS
Ed Wynn, Exhaustive generation of Mrs Perkins's quilt square dissections for low orders, arXiv:1308.5420
EXAMPLE
This dissection is the only example for n=4:
---------
| | | |
--- ---
| | | |
---------
| | | |
--- ---
| | | |
---------
CROSSREFS
KEYWORD
nonn,more
AUTHOR
Ed Wynn, Apr 01 2014
STATUS
approved