User blog comment:DrCeasium/HAN: better definitions/@comment-5029411-20130706031818

3rd idea:

a![1]&(n+1) = a![1,[1, ...[1, 22]&(n) 2]&(n) 2]&(n) (a nested) then [1]&([1]) = [1]&(a)!

The first array in &, [*]&(1) = [*]!!!! Limit is a![1]&(...[1]&(2)...)!

a? = a![a]&([a]&...([a]&([1]))).