a(n) = (12*n + 7)^4.

Terms

a(0) =2401a(1) =130321a(2) =923521a(3) =3418801a(4) =9150625a(5) =20151121a(6) =38950081a(7) =68574961a(8) =112550881a(9) =174900625a(10) =260144641a(11) =373301041a(12) =519885601a(13) =705911761a(14) =937890625a(15) =1222830961a(16) =1568239201a(17) =1982119441a(18) =2472973441a(19) =3049800625a(20) =3722098081a(21) =4499860561a(22) =5393580481a(23) =6414247921a(24) =7573350625a(25) =8882874001