a(n) = (10*n)^5.

Terms

a(0) =0a(1) =100000a(2) =3200000a(3) =24300000a(4) =102400000a(5) =312500000a(6) =777600000a(7) =1680700000a(8) =3276800000a(9) =5904900000a(10) =10000000000a(11) =16105100000a(12) =24883200000a(13) =37129300000a(14) =53782400000a(15) =75937500000a(16) =104857600000