a(n) = sum of terms of {a(1),a(2),a(3),...a(n-1)} which are coprime to n.

Terms

a(0) =1a(1) =1a(2) =2a(3) =2a(4) =6a(5) =2a(6) =14a(7) =2a(8) =24a(9) =2a(10) =56a(11) =2a(12) =114a(13) =2a(14) =86a(15) =2a(16) =318a(17) =2a(18) =524a(19) =2a(20) =632a(21) =2a(22) =1798a(23) =2a(24) =3598a(25) =2a(26) =6736a(27) =2a(28) =12138a(29) =2