a(n) = prime(n)^4.

Terms

a(0) =16a(1) =81a(2) =625a(3) =2401a(4) =14641a(5) =28561a(6) =83521a(7) =130321a(8) =279841a(9) =707281a(10) =923521a(11) =1874161a(12) =2825761a(13) =3418801a(14) =4879681a(15) =7890481a(16) =12117361a(17) =13845841a(18) =20151121a(19) =25411681a(20) =28398241a(21) =38950081a(22) =47458321a(23) =62742241a(24) =88529281a(25) =104060401a(26) =112550881a(27) =131079601a(28) =141158161