a(n) = (5*n + 2)^4.

Terms

a(0) =16a(1) =2401a(2) =20736a(3) =83521a(4) =234256a(5) =531441a(6) =1048576a(7) =1874161a(8) =3111696a(9) =4879681a(10) =7311616a(11) =10556001a(12) =14776336a(13) =20151121a(14) =26873856a(15) =35153041a(16) =45212176a(17) =57289761a(18) =71639296a(19) =88529281a(20) =108243216a(21) =131079601a(22) =157351936a(23) =187388721a(24) =221533456a(25) =260144641a(26) =303595776a(27) =352275361a(28) =406586896