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

A214201

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) =8a(6) =24a(7) =80a(8) =264a(9) =912a(10) =3216a(11) =11488a(12) =41528a(13) =151408a(14) =555792a(15) =2051808a(16) =7610384a(17) =28341536a(18) =105914784a(19) =397028544a(20) =1492351576a(21) =5623204528a(22) =21235347856a(23) =80355038176a(24) =304630332528

External references