Möbius transform of A003960 (with alternating zeros omitted).

Terms

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