a(0) = 0, a(1) = 1, a(2n) = a(n), a(2n+1) = a(n+1) - a(n).

Terms

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