a(n) = -[ n/2 ] + a([ n/2 ]) + a([ n/3 ]) + . . . + a([ n/n ]).

Terms

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