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A130851
Catalan numbers A000108(n) modulo 9.
2
1, 1, 2, 5, 5, 6, 6, 6, 8, 2, 2, 7, 4, 4, 0, 0, 0, 6, 6, 6, 3, 3, 3, 0, 0, 0, 8, 2, 2, 4, 1, 1, 3, 3, 3, 1, 7, 7, 2, 5, 5, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 6, 6, 6, 3, 3, 3, 0, 0, 0, 3, 3, 3, 6, 6, 6, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 8, 2, 2, 4, 1, 1, 3, 3, 3, 7, 4, 4, 5, 8, 8, 0, 0, 0, 3, 3, 3, 6, 6, 6, 0
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