A240124 Number of inequivalent ways to cut an n X n square into squares with integer sides, such that the dissection has 180-degree rotational symmetry, but no other symmetries.
0, 0, 0, 0, 2, 19, 109, 1781, 13660, 397689, 5368943, 289864745
Offset: 1
Examples
The two dissections for n=5: ----------- ----------- | | | | | | | | | | | --- --- ----- | | | | | | | | | ----------- ----------- | | | | | | | | | | | | ----------- ----------- | | | | | | | | | --- | | ----- --- | | | | | | | | | ----------- -----------
Links
- Ed Wynn, Exhaustive generation of Mrs Perkins's quilt square dissections for low orders, arXiv:1308.5420