a(n) = floor(1/{(1+n^4)^(1/4)}), where {} = fractional part.

Terms

a(0) =5a(1) =32a(2) =108a(3) =256a(4) =500a(5) =864a(6) =1372a(7) =2048a(8) =2916a(9) =4000a(10) =5324a(11) =6912a(12) =8788a(13) =10976a(14) =13500a(15) =16384a(16) =19652a(17) =23328a(18) =27436a(19) =32000a(20) =37044a(21) =42592a(22) =48668a(23) =55296a(24) =62500a(25) =70304a(26) =78732a(27) =87808a(28) =97556a(29) =108000