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

A214202

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

Terms

    a(0) =0a(1) =0a(2) =0a(3) =0a(4) =4a(5) =0a(6) =8a(7) =32a(8) =104a(9) =352a(10) =1264a(11) =4480a(12) =15992a(13) =57408a(14) =207152a(15) =750144a(16) =2725456a(17) =9931328a(18) =36282464a(19) =132852224a(20) =487443672a(21) =1791742592a(22) =6597006896a(23) =24326190016a(24) =89825979568a(25) =332110462016

External references