Shifts left and changes sign under Weigh transform.

Terms

a(0) =1a(1) =-1a(2) =1a(3) =0a(4) =-2a(5) =2a(6) =2a(7) =-6a(8) =4a(9) =8a(10) =-23a(11) =12a(12) =43a(13) =-95a(14) =28a(15) =223a(16) =-420a(17) =6a(18) =1194a(19) =-1860a(20) =-597a(21) =6405a(22) =-8235a(23) =-6221a(24) =34441a(25) =-35405a(26) =-48444a(27) =184208a(28) =-143567a(29) =-337144