a(n) = A128020(n)/n.

Terms

a(0) =1a(1) =1a(2) =2a(3) =3a(4) =5a(5) =8a(6) =14a(7) =25a(8) =44a(9) =79a(10) =144a(11) =264a(12) =487a(13) =905a(14) =1689a(15) =3167a(16) =5962a(17) =11261a(18) =21337a(19) =40540a(20) =77219a(21) =147418a(22) =282017a(23) =540533a(24) =1037823a(25) =1995814a(26) =3843790a(27) =7413023a(28) =14314803a(29) =27675286