OFFSET
0,3
COMMENTS
In principle this involution is the signature permutation of yet another Catalan automorphism. However, the question remains what is the most "natural" way to create such an automorphism acting e.g. on S-expressions (i.e. rooted plane binary trees), which would produce this sequence as its signature permutation.
LINKS
CROSSREFS
KEYWORD
nonn
AUTHOR
Antti Karttunen, Jun 11 2007
STATUS
approved