a(1)=1. a(n) = sum of earlier terms, a(k) (1<=k<=n-1), where gcd(a(k),n) is squarefree.

Terms

a(0) =1a(1) =1a(2) =2a(3) =4a(4) =8a(5) =16a(6) =32a(7) =4a(8) =68a(9) =136a(10) =272a(11) =4a(12) =548a(13) =1096a(14) =2192a(15) =4a(16) =4388a(17) =8776a(18) =17552a(19) =4a(20) =35108a(21) =70216a(22) =140432a(23) =4a(24) =280868a(25) =561736a(26) =1123472a(27) =4a(28) =2246948a(29) =4493896