OFFSET
1,2
EXAMPLE
The trees are x, (x,x), (x,(x,x)), ((x,x),x), ((x,x),(x,x)), (x,(x,(x,x))), ((x,(x,x)),x), ((x,x),(x,(x,x))), ((x,(x,x)),(x,x)), ((x,(x,x)),(x,(x,x))) (x,((x,x),x)), (((x,x),x),x), ((x,x)((x,x),x)), (((x,x),x),(x,x)), ((x,(xx)), ((x,x),x)),...
CROSSREFS
KEYWORD
nonn,nice,easy
AUTHOR
Claude Lenormand (claude.lenormand(AT)free.fr), Jan 08 2001
EXTENSIONS
More terms from John W. Layman, Feb 03 2003
STATUS
approved