User blog comment:King2218/Infinite Extensibility/@comment-5029411-20140314165144

3^_{1,2}3 = 3^_{3^_{3}3}3

3^_{1,2}^_{1,2}3 = 3^_{1,2}(3^_{1,2}3)

3^_{2,2}3 = 3^_{1,2}...^_{1,2}3 (3^_{1,2}^_{1,2}^_{1,2}3 ^_{1,2}'s)

3^_{1,3}3 = 3^_{3^_{3,2}3,2}3

3^_{1,1,2}3 = 3^_{1,3^_{1,3}3}3

3^_{1,1,3}3 = 3^_{1,3^_{1,3,2}3,2}3

3^_{1,1,1,2}3 = 3^_{1,1,3^_{1,1,3}3}3

63^_{1,1...1,2}63 (62 1's) ~ Fish Number 2