A068595 - OEIS

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A068595

Number of functions from {1,2,...,n} to {1,2,...,n} such that the sum of the function values is 0 mod 3.

0, 2, 9, 85, 1041, 15552, 274514, 5592406 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,2`
	COMMENTS	`It appears that a(n)=Floor[(n^n)/2] for n>2. If the functions counted are those whose sum of values is 0 mod 2 (instead of 0 mod 3) it appears that we get A057065.`
	LINKS	`sci.math thread`
	CROSSREFS	`Sequence in context: A120959 A125797 A106163 * A037172 A135747 A132431` `Adjacent sequences: A068592 A068593 A068594 * A068596 A068597 A068598`
	KEYWORD	`nonn`
	AUTHOR	`John W. Layman (layman(AT)math.vt.edu), Mar 13 2002`

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Last modified February 17 11:30 EST 2012. Contains 206011 sequences.