Shifts left when Moebius transformation applied twice.

Terms

a(0) =1a(1) =1a(2) =-1a(3) =-3a(4) =-4a(5) =-6a(6) =-2a(7) =-4a(8) =3a(9) =6a(10) =16a(11) =14a(12) =33a(13) =31a(14) =37a(15) =51a(16) =56a(17) =54a(18) =55a(19) =53a(20) =45a(21) =55a(22) =25a(23) =23a(24) =-17a(25) =-8a(26) =-72a(27) =-79a(28) =-135a(29) =-137