Number of strict trees of weight n.

Terms

a(0) =1a(1) =1a(2) =2a(3) =3a(4) =6a(5) =12a(6) =28a(7) =65a(8) =166a(9) =412a(10) =1076a(11) =2806a(12) =7524a(13) =20020a(14) =54744a(15) =148417a(16) =410078a(17) =1126732a(18) =3144500a(19) =8728570a(20) =24555900a(21) =68713420a(22) =194469616a(23) =548088278a(24) =1559301428a(25) =4418131108a(26) =12628267512a(27) =35957541462a(28) =103150588492a(29) =294924202032