OFFSET
0,3
COMMENTS
Hankel transform is A171451.
FORMULA
G.f.: 1/(1-x/(1-x/(1-x/(1-2x/(1-2x/(1-2x/(1-x/(1-x/(1-x/(1-2x/(1-... (continued fraction).
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Paul Barry, Dec 09 2009
STATUS
approved