He asked how many grids there were, not how many rectangles there were. :-) | Hacker News

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		cperciva on Nov 30, 2009 \| parent \| context \| favorite \| on: The 17x17 challenge. "Worth $289.00. This is not a... He asked how many grids there were, not how many rectangles there were. :-)

RiderOfGiraffes on Nov 30, 2009 [–]

Ah - sorry, my turn to do a misreading. As you point out, I computed the number of rectangles that aren't permitted to have all its vertices the same color.

My bad - sorry.

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