Number of unlabeled rooted trees with n nodes where all terminal rooted subtrees are either constant or strict.

A316522

Number of unlabeled rooted trees with n nodes where all terminal rooted subtrees are either constant or strict.

Terms

    a(0) =1a(1) =1a(2) =2a(3) =4a(4) =8a(5) =15a(6) =34a(7) =71a(8) =165a(9) =381a(10) =913a(11) =2193a(12) =5389a(13) =13287a(14) =33155a(15) =83196a(16) =210251a(17) =533956a(18) =1363146a(19) =3494266a(20) =8993164a(21) =23225281

External references