a(n) is the sum of the preceding terms that are coprime to n.

Terms

a(0) =1a(1) =2a(2) =3a(3) =4a(4) =10a(5) =1a(6) =21a(7) =26a(8) =44a(9) =26a(10) =94a(11) =2a(12) =182a(13) =5a(14) =382a(15) =31a(16) =834a(17) =38a(18) =1668a(19) =57a(20) =666a(21) =119a(22) =4216a(23) =157a(24) =8574a(25) =395a(26) =5735a(27) =6385a(28) =29678a(29) =309