a(n) is the number whose binary expansion is A153500(n).

Terms

a(0) =1a(1) =5a(2) =17a(3) =85a(4) =365a(5) =1365a(6) =5285a(7) =21845a(8) =88757a(9) =349525a(10) =1387157a(11) =5592405a(12) =22457045a(13) =89478485a(14) =357214805a(15) =1431655765a(16) =5732215637a(17) =22906492245a(18) =91581229397a(19) =366503875925