a(n) = (10*n)^6.

Terms

a(0) =0a(1) =1000000a(2) =64000000a(3) =729000000a(4) =4096000000a(5) =15625000000a(6) =46656000000a(7) =117649000000a(8) =262144000000a(9) =531441000000a(10) =1000000000000