Second moment of an off-diagonal entry of the inverse Wishart matrix: $\mathbb{E}[(W^{-1})_{ij}^2] = 1/((k-r)(k-r-1)(k-r-3))$, $i\neq j$

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Second moment of an off-diagonal entry of the inverse Wishart matrix: $\mathbb{E}[(W^{-1})_{ij}^2] = 1/((k-r)(k-r-1)(k-r-3))$, $i\neq j$ · Prove2Me