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N1 n2. (2n+1)(2n-1). N(N-1)/2. N2-n+1/n3-n2+n. (2n-1)/2^n.
(2n+1)(2n-1). N(N-1)/2. N2-n+1/n3-n2+n. (2n-1)/2^n.

See also