Powers of three read in base 2.

Terms

a(0) =1a(1) =3a(2) =9a(3) =11a(4) =17a(5) =19a(6) =41a(7) =43a(8) =81a(9) =131a(10) =169a(11) =219a(12) =241a(13) =419a(14) =681a(15) =651a(16) =849a(17) =1203a(18) =2441a(19) =1867a(20) =4369a(21) =3027a(22) =5625a(23) =12475a(24) =15457a(25) =26403a(26) =26553a(27) =48795a(28) =54561a(29) =99667