Moebius transform of A007318 (signed).

Terms

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