a(n) = A063776(n) + 1.

Terms

a(0) =3a(1) =3a(2) =5a(3) =5a(4) =9a(5) =13a(6) =21a(7) =33a(8) =61a(9) =105a(10) =189a(11) =345a(12) =633a(13) =1173a(14) =2193a(15) =4097a(16) =7713a(17) =14573a(18) =27597a(19) =52433a(20) =99881a(21) =190653a(22) =364725a(23) =699073a(24) =1342185a(25) =2581113a(26) =4971069a(27) =9586985a(28) =18512793a(29) =35791473