Number of labeled n-node trees with unlabeled end-points.

A001258

Number of labeled n-node trees with unlabeled end-points.

Terms

    a(0) =1a(1) =1a(2) =2a(3) =6a(4) =25a(5) =135a(6) =892a(7) =6937a(8) =61886a(9) =621956a(10) =6946471a(11) =85302935a(12) =1141820808a(13) =16540534553a(14) =257745010762

External references