Powers of 2 written backwards and sorted.

Terms

a(0) =1a(1) =2a(2) =4a(3) =8a(4) =23a(5) =46a(6) =61a(7) =215a(8) =652a(9) =821a(10) =2918a(11) =4201a(12) =6904a(13) =8402a(14) =48361a(15) =63556a(16) =86723a(17) =270131a(18) =441262a(19) =882425a(20) =2517902a(21) =4034914a(22) =6758401a(23) =8068838a(24) =23445533a(25) =46880176a(26) =61277761a(27) =219078635a(28) =654534862