a(n) = (12*n + 8)^4.

Terms

a(0) =4096a(1) =160000a(2) =1048576a(3) =3748096a(4) =9834496a(5) =21381376a(6) =40960000a(7) =71639296a(8) =116985856a(9) =181063936a(10) =268435456a(11) =384160000a(12) =533794816a(13) =723394816a(14) =959512576a(15) =1249198336a(16) =1600000000a(17) =2019963136a(18) =2517630976a(19) =3102044416a(20) =3782742016a(21) =4569760000a(22) =5473632256a(23) =6505390336a(24) =7676563456a(25) =8999178496