Sum of odd divisors of n.

Terms

a(0) =1a(1) =1a(2) =4a(3) =1a(4) =6a(5) =4a(6) =8a(7) =1a(8) =13a(9) =6a(10) =12a(11) =4a(12) =14a(13) =8a(14) =24a(15) =1a(16) =18a(17) =13a(18) =20a(19) =6a(20) =32a(21) =12a(22) =24a(23) =4a(24) =31a(25) =14a(26) =40a(27) =8a(28) =30a(29) =24