a(n) = numerator of Sum_{d|n} (d/sigma(d)) where sigma(k) = the sum of the divisors of k (A000203).

Terms

a(0) =1a(1) =5a(2) =7a(3) =47a(4) =11a(5) =35a(6) =15a(7) =97a(8) =127a(9) =55a(10) =23a(11) =47a(12) =27a(13) =25a(14) =77a(15) =3567a(16) =35a(17) =635a(18) =39a(19) =517a(20) =105a(21) =115a(22) =47a(23) =97a(24) =491a(25) =45a(26) =1621a(27) =235a(28) =59a(29) =385