a(n) = (12*n + 11)^4.

Terms

a(0) =14641a(1) =279841a(2) =1500625a(3) =4879681a(4) =12117361a(5) =25411681a(6) =47458321a(7) =81450625a(8) =131079601a(9) =200533921a(10) =294499921a(11) =418161601a(12) =577200625a(13) =777796321a(14) =1026625681a(15) =1330863361a(16) =1698181681a(17) =2136750625a(18) =2655237841a(19) =3262808641a(20) =3969126001a(21) =4784350561a(22) =5719140625a(23) =6784652161a(24) =7992538801a(25) =9354951841