Number of leaf-balanced trees with n nodes.

Terms

a(0) =1a(1) =1a(2) =2a(3) =4a(4) =8a(5) =14a(6) =25a(7) =41a(8) =70a(9) =116a(10) =198a(11) =331a(12) =568a(13) =957a(14) =1635a(15) =2776a(16) =4757a(17) =8144a(18) =14089a(19) =24428a(20) =42707a(21) =74895a(22) =131983a(23) =232895a(24) =411725a(25) =727434a(26) =1284809a(27) =2265997a(28) =3992154a(29) =7023718