a(n) = s(k), where k is the n-th number k such that s(j)<s(k) for all j<k, where s = A026166.

Terms

a(0) =1a(1) =2a(2) =4a(3) =8a(4) =10a(5) =16a(6) =20a(7) =22a(8) =26a(9) =28a(10) =34a(11) =40a(12) =44a(13) =46a(14) =52a(15) =56a(16) =58a(17) =62a(18) =64a(19) =70a(20) =74a(21) =76a(22) =80a(23) =82a(24) =88a(25) =94a(26) =98a(27) =100a(28) =106a(29) =112