a(n) = 2*A135318(n+1) - A135318(n).

Terms

a(0) =1a(1) =1a(2) =3a(3) =4a(4) =5a(5) =6a(6) =11a(7) =14a(8) =21a(9) =26a(10) =43a(11) =54a(12) =85a(13) =106a(14) =171a(15) =214a(16) =341a(17) =426a(18) =683a(19) =854a(20) =1365a(21) =1706a(22) =2731a(23) =3414a(24) =5461a(25) =6826a(26) =10923a(27) =13654a(28) =21845a(29) =27306