A240122 Number of inequivalent ways to cut an n X n square into squares with integer sides, such that the dissection has 90-degree rotational symmetry and no reflective symmetry.
0, 0, 0, 0, 1, 2, 12, 40, 154, 760, 3260, 22730
Offset: 1
Examples
The two dissections for n=6: ------------- ------------- | | | | | | | | | | | | --- ------- --- ------- | | | | | | | | | | --------- | --------- | | | | | | | | | | | | ----- ----- ------------- | | | | | | | | | | | | --------- --------- | | | | | | | | | | ------- --- ------- --- | | | | | | | | | | | | ------------- -------------
Links
- Ed Wynn, Exhaustive generation of Mrs Perkins's quilt square dissections for low orders, arXiv:1308.5420