a(n) = (10*n + 2)^4.

Terms

a(0) =16a(1) =20736a(2) =234256a(3) =1048576a(4) =3111696a(5) =7311616a(6) =14776336a(7) =26873856a(8) =45212176a(9) =71639296a(10) =108243216a(11) =157351936a(12) =221533456a(13) =303595776a(14) =406586896a(15) =533794816a(16) =688747536a(17) =875213056a(18) =1097199376a(19) =1358954496a(20) =1664966416a(21) =2019963136a(22) =2428912656a(23) =2897022976a(24) =3429742096a(25) =4032758016a(26) =4711998736