Floor(1/{(9+n^4)^(1/4)}), where {} = fractional part.

Terms

a(0) =1a(1) =4a(2) =12a(3) =28a(4) =55a(5) =96a(6) =152a(7) =227a(8) =324a(9) =444a(10) =591a(11) =768a(12) =976a(13) =1219a(14) =1500a(15) =1820a(16) =2183a(17) =2592a(18) =3048a(19) =3555a(20) =4116a(21) =4732a(22) =5407a(23) =6144a(24) =6944a(25) =7811a(26) =8748a(27) =9756a(28) =10839a(29) =12000