a(n) = (11*n + 9)^4.

Terms

a(0) =6561a(1) =160000a(2) =923521a(3) =3111696a(4) =7890481a(5) =16777216a(6) =31640625a(7) =54700816a(8) =88529281a(9) =136048896a(10) =200533921a(11) =285610000a(12) =395254161a(13) =533794816a(14) =705911761a(15) =916636176a(16) =1171350625a(17) =1475789056a(18) =1836036801a(19) =2258530576a(20) =2750058481a(21) =3317760000a(22) =3969126001a(23) =4711998736