Floor[1/{(3+n^4)^(1/4)}], where {}=fractional part.

Terms

a(0) =2a(1) =11a(2) =36a(3) =85a(4) =166a(5) =288a(6) =457a(7) =682a(8) =972a(9) =1333a(10) =1774a(11) =2304a(12) =2929a(13) =3658a(14) =4500a(15) =5461a(16) =6550a(17) =7776a(18) =9145a(19) =10666a(20) =12348a(21) =14197a(22) =16222a(23) =18432a(24) =20833a(25) =23434a(26) =26244a(27) =29269a(28) =32518a(29) =36000