a(n) = (5*n)^3.

Terms

a(0) =0a(1) =125a(2) =1000a(3) =3375a(4) =8000a(5) =15625a(6) =27000a(7) =42875a(8) =64000a(9) =91125a(10) =125000a(11) =166375a(12) =216000a(13) =274625a(14) =343000a(15) =421875a(16) =512000a(17) =614125a(18) =729000a(19) =857375a(20) =1000000a(21) =1157625a(22) =1331000a(23) =1520875a(24) =1728000a(25) =1953125a(26) =2197000a(27) =2460375a(28) =2744000a(29) =3048625