a(n) = floor(A058303*(2^(n-2)+1/2)).

Terms

a(0) =14a(1) =21a(2) =35a(3) =63a(4) =120a(5) =233a(6) =459a(7) =911a(8) =1816a(9) =3625a(10) =7244a(11) =14481a(12) =28954a(13) =57902a(14) =115798a(15) =231590a(16) =463173a(17) =926340a(18) =1852673a(19) =3705340a(20) =7410673a(21) =14821340a(22) =29642673a(23) =59285340a(24) =118570674a(25) =237141341a(26) =474282675a(27) =948565344a(28) =1897130682a(29) =3794261357