Number of rooted identity trees with n vertices whose non-leaf terminal subtrees are not all different.

A324971

Number of rooted identity trees with n vertices whose non-leaf terminal subtrees are not all different.

Terms

    a(0) =0a(1) =0a(2) =0a(3) =0a(4) =0a(5) =1a(6) =4a(7) =12a(8) =31a(9) =79a(10) =192a(11) =459a(12) =1082a(13) =2537a(14) =5922a(15) =13816a(16) =32222a(17) =75254a(18) =176034a(19) =412667a(20) =969531a(21) =2283278

External references