a(n) is the number whose binary expansion is A153498(n).

Terms

a(0) =1a(1) =7a(2) =21a(3) =73a(4) =341a(5) =1453a(6) =5461a(7) =21157a(8) =87381a(9) =354997a(10) =1398101a(11) =5548693a(12) =22369621a(13) =89828053a(14) =357913941a(15) =1428859477a(16) =5726623061a(17) =22928862037a(18) =91625968981a(19) =366324918613