a(n) = (11*n + 4)^4.

Terms

a(0) =256a(1) =50625a(2) =456976a(3) =1874161a(4) =5308416a(5) =12117361a(6) =24010000a(7) =43046721a(8) =71639296a(9) =112550881a(10) =168896016a(11) =244140625a(12) =342102016a(13) =466948881a(14) =623201296a(15) =815730721a(16) =1049760000a(17) =1330863361a(18) =1664966416a(19) =2058346161a(20) =2517630976a(21) =3049800625a(22) =3662186256a(23) =4362470401a(24) =5158686976a(25) =6059221281