User blog comment:Antares.I.G.Harrison/Bug-Fixing Psi Notation/@comment-26084716-20150217135710

So n_n_n_....._n (m) (Let's call this X) = (X Calculated from Backwards like normal pentation/tetration = Y (i.e. n_m_% = n_(m_(%))) Y_Y_..._Y (m-1)