Third column of A155092.

Terms

a(0) =1a(1) =1a(2) =2a(3) =4a(4) =7a(5) =14a(6) =27a(7) =54a(8) =106a(9) =212a(10) =420a(11) =840a(12) =1673a(13) =3346a(14) =6678a(15) =13356a(16) =26685a(17) =53370a(18) =106686a(19) =213372a(20) =426638a(21) =853276a(22) =1706340a(23) =3412680a(24) =6824940a(25) =13649880a(26) =27298920a(27) =54597840a(28) =109194007a(29) =218388014