User blog comment:King2218/FGH Things/@comment-25418284-20140305080757/@comment-24509095-20140305085648

Ah. I think we could just work our way up:

f(w+1) = w+2

f_1(w+1) = w2+2

f_2(w+1) = (w^2)2 + w2 ?

...

OR, we could make a new rule! :D