Numerator of Sum_{i=2..n} (-1)^i/(i*phi(i)).

Terms

a(0) =1a(1) =1a(2) =11a(3) =49a(4) =59a(5) =131a(6) =559a(7) =14533a(8) =15289a(9) =33031a(10) =34417a(11) =441877a(12) =452173a(13) =2224829a(14) =9034451a(15) =152504587a(16) =155227307a(17) =2932982513a(18) =2967901397a(19) =2945730677a(20) =2971126229a(21) =6189267977a(22) =6250111487a(23) =155668689479a(24) =156604743479