The number of binary Niven numbers (A049445) not exceeding 2^n.

Terms

a(0) =2a(1) =3a(2) =5a(3) =8a(4) =13a(5) =21a(6) =37a(7) =65a(8) =124a(9) =232a(10) =431a(11) =760a(12) =1424a(13) =2575a(14) =4772a(15) =8932a(16) =17033a(17) =32225a(18) =61764a(19) =117897a(20) =224944a(21) =428155a(22) =814294a(23) =1547596a(24) =2934212a(25) =5572886a(26) =10609364a(27) =20237826a(28) =38773350a(29) =74609953