a(n) = floor(cos(n)).

Terms

a(0) =1a(1) =0a(2) =-1a(3) =-1a(4) =-1a(5) =0a(6) =0a(7) =0a(8) =-1a(9) =-1a(10) =-1a(11) =0a(12) =0a(13) =0a(14) =0a(15) =-1a(16) =-1a(17) =-1a(18) =0a(19) =0a(20) =0a(21) =-1a(22) =-1a(23) =-1a(24) =0a(25) =0a(26) =0a(27) =-1a(28) =-1a(29) =-1