  Computing moments of various parameter estimators related to an
autoregressive model of Statistics, one needs to evaluate several non-trivial
limits. This was done by arXiv:1506.03131 for the case of two, three and four
dimensions; in this article, we present a proof of a fully general formula,
based on an ingenious solution of
https://mathoverflow.net/users/4312/fedor-petrov.
