Number of partitions of 1 into fractions i/j with 1<=i<j<=n and i,j coprime.

Terms

a(0) =0a(1) =1a(2) =3a(3) =6a(4) =12a(5) =21a(6) =35a(7) =58a(8) =106a(9) =188a(10) =243a(11) =493a(12) =593a(13) =1062a(14) =3275a(15) =5507a(16) =5803a(17) =12426a(18) =12915a(19) =42410a(20) =131772a(21) =167587a(22) =168841a(23) =428012a(24) =839367a(25) =1015501a(26) =1968161a(27) =5787286a(28) =5791850a(29) =15163758