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A240123
Number of inequivalent ways to cut an n X n square into squares with integer sides, such that the dissection has a reflective symmetry in one diagonal, but no other symmetries.
3
0, 0, 1, 3, 19, 107, 847, 8647, 119835, 2255123, 58125783, 2050662011
OFFSET
1,4
COMMENTS
'Inequivalent' has the same sense as in A224239: we do not regard dissections that differ by a rotation and/or reflection as distinct.
EXAMPLE
The three dissections for n=4:
--------- --------- ---------
| | | | | | | | | |
| ----- | | | | ---
| | | | | | | | | |
--------- --------- | ---
| | | | | | | | | | | |
--------- | ----- ---------
| | | | | | | | | | | | | |
--------- --------- ---------
CROSSREFS
KEYWORD
nonn,more
AUTHOR
Ed Wynn, Apr 01 2014
STATUS
approved