a(n) = least k such that s(k) = n, where s = A030767.

Terms

a(0) =2a(1) =1a(2) =6a(3) =5a(4) =9a(5) =14a(6) =15a(7) =21a(8) =22a(9) =30a(10) =68a(11) =31a(12) =41a(13) =229a(14) =42a(15) =54a(16) =170a(17) =55a(18) =69a(19) =173a(20) =70a(21) =87a(22) =174a(23) =88a(24) =107a(25) =175a(26) =348a(27) =108a(28) =205a(29) =237