User blog comment:Ikosarakt1/Coding strings as ordinals (for Friedman's n(k))/@comment-5029411-20140105155747

If have no letters, then number is equal to 0.

A(n) = n+1

B(n) = AA...AAB(n-1)

C(n) = BB...BBA (n B's)

D(n) = CC...CCA (n C's)

...

What is order type?