Exclusionary biquadrates (fourth powers).

Terms

a(0) =16a(1) =81a(2) =256a(3) =2401a(4) =4096a(5) =6561a(6) =331776a(7) =531441a(8) =614656a(9) =1048576a(10) =3111696a(11) =7311616a(12) =7890481a(13) =11316496a(14) =12117361a(15) =21051121a(16) =62742241a(17) =74805201a(18) =1698181681a(19) =4430766096a(20) =6505390336a(21) =11019960576a(22) =11716114081a(23) =479174066176a(24) =505022001201