Floor(1/{(5+n^4)^(1/4)}), where {}=fractional part.

Terms

a(0) =1a(1) =7a(2) =22a(3) =51a(4) =100a(5) =173a(6) =274a(7) =409a(8) =583a(9) =800a(10) =1064a(11) =1382a(12) =1757a(13) =2195a(14) =2700a(15) =3276a(16) =3930a(17) =4665a(18) =5487a(19) =6400a(20) =7408a(21) =8518a(22) =9733a(23) =11059a(24) =12500a(25) =14060a(26) =15746a(27) =17561a(28) =19511a(29) =21600