A130856 - OEIS

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A130856

The digital root (A010888) of the Catalan numbers A000108.

1, 1, 2, 5, 5, 6, 6, 6, 8, 2, 2, 7, 4, 4, 9, 9, 9, 6, 6, 6, 3, 3, 3, 9, 9, 9, 8, 2, 2, 4, 1, 1, 3, 3, 3, 1, 7, 7, 2, 5, 5, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 6, 6, 6, 3, 3, 3, 9, 9, 9, 3, 3, 3, 6, 6, 6, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 8, 2, 2, 4, 1, 1, 3 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,3`
	LINKS	`Nathaniel Johnston, Table of n, a(n) for n = 0..10000`
	MAPLE	`A130856 := proc(n) option remember: if(n=0)then return 1:fi: return ((add(procname(k)*procname(n-1-k), k=0..n-1)-1) mod 9) + 1 end: seq(A130856(n), n=0..100); # Nathaniel Johnston, May 05 2011`
	CROSSREFS	`Cf. A000108, A010888, A130851.` `Sequence in context: A205444 A073101 A130851 * A004095 A145434 A117899` `Adjacent sequences: A130853 A130854 A130855 * A130857 A130858 A130859`
	KEYWORD	`nonn,easy,base`
	AUTHOR	`N. J. A. Sloane (njas(AT)research.att.com), Aug 21 2007`
	EXTENSIONS	`Name corrected by Nathaniel Johnston (nathaniel(AT)nathanieljohnston.com), May 05 2011`

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Last modified February 16 23:45 EST 2012. Contains 205978 sequences.