First differences of Thue-Morse sequence A001285.

Terms

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