User blog comment:ArtismScrub/Analysis (and possible extension) to Fish's s(n) map/@comment-80.98.179.160-20180107164323/@comment-80.98.179.160-20180109164954

First rule: s(n,k{1}2)[f(n)]=s(n,n,n,n,...(k "n"s)...,n,n,n)[fn(n)].