User blog comment:Alejandro Magno/Extended Arrow Notation/@comment-5150073-20140918210020/@comment-25371339-20140918232401

Wrong!

You did not define a^(^^(^(^^(n)^^)^)^^)^b, a^(^^^(^(^^^(n)^^^)^)^^^)^b, and a^(^^^(^^(^^^(n)^^^)^^)^^^)^b.

Re-check the article.