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

Terms

a(0) =1a(1) =2a(2) =3a(3) =7a(4) =11a(5) =27a(6) =31a(7) =67a(8) =83a(9) =119a(10) =135a(11) =235a(12) =251a(13) =395a(14) =431a(15) =495a(16) =559a(17) =815a(18) =851a(19) =1175a(20) =1239a(21) =1383a(22) =1483a(23) =1967a(24) =2031a(25) =2431a(26) =2575a(27) =2899a(28) =3043a(29) =3827