  ( A 1 10 ) = 1024
  ( A 2 4 ) = 65536
  ( A 3 3 ) = 65536
; 
  ( f n ) = 2n
  ( g n ) = 2^n
  ( h n ) = 2 ^ 2 ^ 2^ ... ( the number of 2s is n )

  ( A 1 10 ) = 1024
  ( A 2 4 ) = 65536
  ( A 3 3 ) = 65536
  ( f n ) = 2n
  ( g n ) = 2^n
  ( h n ) = 2 ^ 2 ^ 2^ ... ( the number of 2s is n )
