User blog comment:Wythagoras/Dollars function/@comment-5029411-20130716141200

a$◇(0)◆[0,{b+1}c+1] = a$◇(0)◆[◇(0)◆[...◇(0)◆[◇(0)◆[0,{b+1}c],{b+1}c]...,{b+1}c],{b+1}c] (a nested)