Number of binary strict trees of weight n.

Terms

a(0) =1a(1) =1a(2) =1a(3) =2a(4) =3a(5) =6a(6) =10a(7) =23a(8) =46a(9) =108a(10) =231a(11) =561a(12) =1285a(13) =3139a(14) =7348a(15) =18265a(16) =43907a(17) =109887a(18) =267582a(19) =675866a(20) =1669909a(21) =4238462a(22) =10555192a(23) =26955062a(24) =67706032a(25) =173591181a(26) =438555624a(27) =1129088048a(28) =2869732770a(29) =7410059898