OFFSET
0,4
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 0..1000
MATHEMATICA
Ceiling[CatalanNumber[Range[0, 30]]/2] (* Harvey P. Dale, Feb 16 2014 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Antti Karttunen, Jun 11 2007
STATUS
approved