Number of rooted / unrooted tree shapes

Source: R/data.R

nRootedShapes and nUnrootedShapes give the number of (un)rooted binary trees on n unlabelled leaves.

nRootedShapes

nUnrootedShapes

Format

An object of class integer64 of length 55.

An object of class integer64 of length 60.

Source

nRootedShapes corresponds to the Wedderburn-Etherington numbers, OEIS A001190

nUnrootedShapes is OEIS A000672