BCR(n): write in binary, complement, reverse.

Terms

a(0) =1a(1) =0a(2) =2a(3) =0a(4) =6a(5) =2a(6) =4a(7) =0a(8) =14a(9) =6a(10) =10a(11) =2a(12) =12a(13) =4a(14) =8a(15) =0a(16) =30a(17) =14a(18) =22a(19) =6a(20) =26a(21) =10a(22) =18a(23) =2a(24) =28a(25) =12a(26) =20a(27) =4a(28) =24a(29) =8