User blog comment:ArtismScrub/New array notation idea?/@comment-25601061-20171204221950/@comment-32783837-20171204234103

So...

μ(n,n,n) = fω(n)

μ(n,n,n,...,n,n,n) with m n's = fωm-2(n)

limit:  fωω(n)