OFFSET
2,2
COMMENTS
REFERENCES
See A000682.
LINKS
P. Di Francesco, O. Golinelli and E. Guitter, Meanders: exact asymptotics, arXiv:cond-mat/9910453 [cond-mat.stat-mech], 1999-2000; Nuclear Physics B, volume 570, issue 3, 27 March 2000, 699-712.
EXAMPLE
n = 5, || indicates an arch of length one with exactly one covering arch.
/\ /\ /\
/\ //\\ //\\ /\ /\ /\ /\ /\ / \
//\\ ///\\\ ///\\\ //\\ /\ //\\ //\\ //\\ //\\ /\ /\ /\ //\/\\
|| || || || || || ||||
/\ /\
/ \ / \ /\
//\ \ / /\\ / \
///\\/\\ /\ /\ //\//\\\ //\/\\ /\ /\
|| || |||| a(5) = 12.
CROSSREFS
KEYWORD
nonn,more
AUTHOR
Roger Ford, Aug 01 2021
STATUS
approved