OFFSET
0,1
LINKS
Guo-Niu Han, Enumeration of Standard Puzzles, 2011. [Cached copy]
Guo-Niu Han, Enumeration of Standard Puzzles, arXiv:2006.14070 [math.CO], 2020.
FORMULA
PROG
(PARI) Cat(n) = binomial(2*n, n)/(n+1); \\ A000108
a(n) = Cat(n)+sum(k=0, n, Cat(k)); \\ Michel Marcus, Apr 28 2020
CROSSREFS
KEYWORD
nonn
AUTHOR
Antti Karttunen, Mar 17 2003
STATUS
approved