a(n) = floor(tan(n)).

Terms

a(0) =0a(1) =1a(2) =-3a(3) =-1a(4) =1a(5) =-4a(6) =-1a(7) =0a(8) =-7a(9) =-1a(10) =0a(11) =-226a(12) =-1a(13) =0a(14) =7a(15) =-1a(16) =0a(17) =3a(18) =-2a(19) =0a(20) =2a(21) =-2a(22) =0a(23) =1a(24) =-3a(25) =-1a(26) =1a(27) =-4a(28) =-1a(29) =0