a(n) = (3*n+2)^4.

Terms

a(0) =16a(1) =625a(2) =4096a(3) =14641a(4) =38416a(5) =83521a(6) =160000a(7) =279841a(8) =456976a(9) =707281a(10) =1048576a(11) =1500625a(12) =2085136a(13) =2825761a(14) =3748096a(15) =4879681a(16) =6250000a(17) =7890481a(18) =9834496a(19) =12117361a(20) =14776336a(21) =17850625a(22) =21381376a(23) =25411681a(24) =29986576a(25) =35153041a(26) =40960000a(27) =47458321a(28) =54700816a(29) =62742241