Inverse Möbius transform of A003960.

Terms

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