a(n) = (11*n + 7)^4.

Terms

a(0) =2401a(1) =104976a(2) =707281a(3) =2560000a(4) =6765201a(5) =14776336a(6) =28398241a(7) =49787136a(8) =81450625a(9) =126247696a(10) =187388721a(11) =268435456a(12) =373301041a(13) =506250000a(14) =671898241a(15) =875213056a(16) =1121513121a(17) =1416468496a(18) =1766100625a(19) =2176782336a(20) =2655237841a(21) =3208542736a(22) =3844124001a(23) =4569760000