a(n) = (5n + 4)^3.

Terms

a(0) =64a(1) =729a(2) =2744a(3) =6859a(4) =13824a(5) =24389a(6) =39304a(7) =59319a(8) =85184a(9) =117649a(10) =157464a(11) =205379a(12) =262144a(13) =328509a(14) =405224a(15) =493039a(16) =592704a(17) =704969a(18) =830584a(19) =970299a(20) =1124864a(21) =1295029a(22) =1481544a(23) =1685159a(24) =1906624