Numerator of Sum_{1<=j<=k<=n, gcd(j,k)=1} 1/(j*k).

Terms

a(0) =1a(1) =3a(2) =2a(3) =7a(4) =11a(5) =59a(6) =33a(7) =737a(8) =631a(9) =1973a(10) =439a(11) =4967a(12) =3595a(13) =7283a(14) =289433a(15) =891067a(16) =82391a(17) =647449a(18) =2764637a(19) =160300109a(20) =119168603a(21) =1923477a(22) =19032303a(23) =442903921a(24) =278705461a(25) =1155909107a(26) =84109239017a(27) =255355122859a(28) =632225777a(29) =203232858383