a(n) = (10*n + 6)^4.

Terms

a(0) =1296a(1) =65536a(2) =456976a(3) =1679616a(4) =4477456a(5) =9834496a(6) =18974736a(7) =33362176a(8) =54700816a(9) =84934656a(10) =126247696a(11) =181063936a(12) =252047376a(13) =342102016a(14) =454371856a(15) =592240896a(16) =759333136a(17) =959512576a(18) =1196883216a(19) =1475789056a(20) =1800814096a(21) =2176782336a(22) =2608757776a(23) =3102044416a(24) =3662186256