f(n) = 8n^2 - (109/2)n + 201/2. f(9) = 420.
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Pfft that's the formula you found / I just guessed
f(n) = 8n^2 - (109/2)n + 201/2. f(9) = 420.
__________________
Pfft that's the formula you found / I just guessed
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