OFFSET
0,3
COMMENTS
This automorphism of rooted plane binary trees switches the two descendant trees for every other vertex as it descends along the 111... ray, but not starting swapping until at the right-hand side child of the root, leaving the root itself fixed. Specifically, *A154450 = psi(A154440), where the isomorphism psi is given in A153141 (see further comments there).
LINKS
PROG
CROSSREFS
KEYWORD
nonn
AUTHOR
Antti Karttunen, Jan 17 2009
STATUS
approved