Signed version of A164984.

Terms

a(0) =1a(1) =-1a(2) =1a(3) =3a(4) =-3a(5) =1a(6) =-5a(7) =9a(8) =-5a(9) =1a(10) =11a(11) =-23a(12) =19a(13) =-7a(14) =1a(15) =-21a(16) =57a(17) =-61a(18) =33a(19) =-9a(20) =1a(21) =43a(22) =-135a(23) =179a(24) =-127a(25) =51a(26) =-11a(27) =1a(28) =-85a(29) =313