summation of (2r-1)^2 from r=1 to (n+1)/2 - (summation of (2r^2) from r=1 to (n-1)/2)summation of (2r-1)^2 from r=1 to (n+1)/2 - (summation of (2r^2) from r=1 to (n-1)/2)

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