Number of primitive subsequences of {1, 2, ..., n}.

Terms

a(0) =1a(1) =2a(2) =3a(3) =5a(4) =7a(5) =13a(6) =17a(7) =33a(8) =45a(9) =73a(10) =103a(11) =205a(12) =253a(13) =505a(14) =733a(15) =1133a(16) =1529a(17) =3057a(18) =3897a(19) =7793a(20) =10241a(21) =16513a(22) =24593a(23) =49185a(24) =59265a(25) =109297a(26) =163369a(27) =262489a(28) =355729a(29) =711457