User blog:DrCocktor/Figure out the rule of this function

A(1) = 1

A(2) = 8

A(3) = 81

A(4) = 1024

A(5) = 15625

A(6) = 279936

A(7) = 5764801

A(8) = 134217728

A(9) = 3486784401

A(10) = 100000000000