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There is a typo at the very beginning of the following formula let p2 = ((n+1)*(n*1)) * odd_full + (n*n) * even_full - (n+1) * odd_corners + n * even_corners; on the day 21 wiki page. The n*1 product should be a sum n+1.

By the way, I spent a day on this formula and could not come up with a correct result just because I did not realize corners at 4 cardinal directions could be summed up to be 4 corners of one full garden. I was adding and subtracting them independently, and apparently I must have a bug in my code. So many thanks for a visual, cohesive rundown!