sum (k^5 - 20 k^4 + 163 k^3 - 676 k^2 + 1424 k - 1209)/2^k from k = 0 to inf sum (k^5 - 20 k^4 + 163 k^3 - 676 k^2 + 1424 k - 1209)/2^k from k = 0 to inf

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