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Sep 9 at 9:56 comment added Shadowtrot Yeah I realized that later, another case is where n=1 has only one unique solution but n=63 has at least 10.
Sep 9 at 9:34 history edited Shadowtrot CC BY-SA 4.0
Removed false optimization "skip half of n", fixed asterisks becoming md italics.
Sep 9 at 9:27 history edited Shadowtrot CC BY-SA 4.0
deleted 160 characters in body
Sep 9 at 6:59 comment added miracle173 "All n=[33,63] pieces could be skipped ..." No, that is wrong. The grid-squares of a polyomino are connected. The inversion usually isn't.
S Sep 8 at 19:51 review First answers
Sep 8 at 21:47
S Sep 8 at 19:51 history answered Shadowtrot CC BY-SA 4.0