a(n) = 1 + Sum_{i=1..n} (n-i+1)*phi(i).

Terms

a(0) =1a(1) =2a(2) =4a(3) =8a(4) =14a(5) =24a(6) =36a(7) =54a(8) =76a(9) =104a(10) =136a(11) =178a(12) =224a(13) =282a(14) =346a(15) =418a(16) =498a(17) =594a(18) =696a(19) =816a(20) =944a(21) =1084a(22) =1234a(23) =1406a(24) =1586a(25) =1786a(26) =1998a(27) =2228a(28) =2470a(29) =2740