OFFSET
0,3
FORMULA
a(n) = A000108(n) mod 9. - Philippe Deléham, Apr 28 2009
MATHEMATICA
Mod[CatalanNumber[Range[0, 120]], 9] (* Harvey P. Dale, Feb 20 2018 *)
CROSSREFS
KEYWORD
nonn,easy,base
AUTHOR
N. J. A. Sloane, Aug 21 2007
EXTENSIONS
Name corrected by Nathaniel Johnston, May 05 2011
STATUS
approved