Sequence shifts left nine places under Weigh transform with a(n) = signum(n) for n<9.

Terms

a(0) =0a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =1a(7) =1a(8) =1a(9) =1a(10) =1a(11) =1a(12) =2a(13) =2a(14) =3a(15) =4a(16) =5a(17) =6a(18) =8a(19) =10a(20) =12a(21) =16a(22) =20a(23) =26a(24) =35a(25) =45a(26) =59a(27) =79a(28) =104a(29) =137