a(1) = 1; for n > 1, if n is even, a(n) = A055938(a(n/2)), otherwise a(n) = A005187(a(A064989(n))).

Terms

a(0) =1a(1) =2a(2) =3a(3) =5a(4) =4a(5) =6a(6) =7a(7) =12a(8) =8a(9) =9a(10) =11a(11) =13a(12) =19a(13) =14a(14) =10a(15) =27a(16) =35a(17) =17a(18) =67a(19) =20a(20) =16a(21) =24a(22) =131a(23) =28a(24) =15a(25) =40a(26) =22a(27) =29a(28) =259a(29) =21