a(n) = Sum_{k=1..n} phi(k)^2.

Terms

a(0) =1a(1) =2a(2) =6a(3) =10a(4) =26a(5) =30a(6) =66a(7) =82a(8) =118a(9) =134a(10) =234a(11) =250a(12) =394a(13) =430a(14) =494a(15) =558a(16) =814a(17) =850a(18) =1174a(19) =1238a(20) =1382a(21) =1482a(22) =1966a(23) =2030a(24) =2430a(25) =2574a(26) =2898a(27) =3042a(28) =3826a(29) =3890