User blog comment:! cook the lettuce/Despacit's Number Competition/@comment-38877333-20191208011846/@comment-24923514-20191208215032

"[a] = 15^n"

What is n?

"[#,a,b] = [#, [#, [...[a]...]] (with b+1 []'s)]"

So [#,a,3] = [#,[#,[#,[a]]]] for example?