a(n) = (12*n + 6)^4.

Terms

a(0) =1296a(1) =104976a(2) =810000a(3) =3111696a(4) =8503056a(5) =18974736a(6) =37015056a(7) =65610000a(8) =108243216a(9) =168896016a(10) =252047376a(11) =362673936a(12) =506250000a(13) =688747536a(14) =916636176a(15) =1196883216a(16) =1536953616a(17) =1944810000a(18) =2428912656a(19) =2998219536a(20) =3662186256a(21) =4430766096a(22) =5314410000a(23) =6324066576a(24) =7471182096a(25) =8767700496