Sequence shifts left seven places under Weigh transform with a(n) = signum(n) for n<7.

Terms

a(0) =0a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =1a(7) =1a(8) =1a(9) =1a(10) =2a(11) =2a(12) =3a(13) =4a(14) =5a(15) =6a(16) =8a(17) =11a(18) =14a(19) =19a(20) =26a(21) =35a(22) =48a(23) =65a(24) =89a(25) =122a(26) =167a(27) =230a(28) =317a(29) =438