Denominator of Sum_{k=1..n} phi(k)/k.

Terms

a(0) =1a(1) =2a(2) =6a(3) =3a(4) =15a(5) =5a(6) =35a(7) =70a(8) =210a(9) =210a(10) =2310a(11) =770a(12) =10010a(13) =10010a(14) =30030a(15) =15015a(16) =255255a(17) =255255a(18) =4849845a(19) =4849845a(20) =4849845a(21) =4849845a(22) =111546435a(23) =37182145a(24) =37182145a(25) =37182145a(26) =111546435a(27) =111546435a(28) =3234846615a(29) =3234846615