a(n) = (7*n + 5)^3.

Terms

a(0) =125a(1) =1728a(2) =6859a(3) =17576a(4) =35937a(5) =64000a(6) =103823a(7) =157464a(8) =226981a(9) =314432a(10) =421875a(11) =551368a(12) =704969a(13) =884736a(14) =1092727a(15) =1331000a(16) =1601613a(17) =1906624a(18) =2248091a(19) =2628072a(20) =3048625a(21) =3511808a(22) =4019679a(23) =4574296a(24) =5177717