Answer to Question #12768 in Combinatorics | Number Theory for Michael

Question #12768
Calculate sum over permutations \tau(i,j): let $x\in R_{2n}$ $\sum_{\tau(i,j)}(x_i-x_j)^2(a(i,j))^2.$ If a(i,j)=1 if j<=n<i; equal to -1 if i<=n<j, equal 0 otherwise.
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