Powers of 2 written backwards.

Terms

a(0) =1a(1) =2a(2) =4a(3) =8a(4) =61a(5) =23a(6) =46a(7) =821a(8) =652a(9) =215a(10) =4201a(11) =8402a(12) =6904a(13) =2918a(14) =48361a(15) =86723a(16) =63556a(17) =270131a(18) =441262a(19) =882425a(20) =6758401a(21) =2517902a(22) =4034914a(23) =8068838a(24) =61277761a(25) =23445533a(26) =46880176a(27) =827712431a(28) =654534862a(29) =219078635