Number of rooted planar binary unlabeled trees with n leaves and caterpillar index <= 4.

A214200

Number of rooted planar binary unlabeled trees with n leaves and caterpillar index <= 4.

Terms

    a(0) =0a(1) =1a(2) =1a(3) =2a(4) =5a(5) =6a(6) =26a(7) =84a(8) =269a(9) =870a(10) =2910a(11) =9788a(12) =33250a(13) =114012a(14) =394260a(15) =1372776a(16) =4809917a(17) =16947462a(18) =60012470a(19) =213462380a(20) =762355286a(21) =2732658484a(22) =9827926060a(23) =35453715480a(24) =128255260690a(25) =465163021788

External references