id:A068595 - OEIS Search Results

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

+0
1

0, 2, 9, 85, 1041, 15552, 274514, 5592406 (list; graph; listen)

	OFFSET	`1,2`
	COMMENT	`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 this_sequence A037172 A135747 A132431` `Adjacent sequences: A068592 A068593 A068594 this_sequence A068596 A068597 A068598`
	KEYWORD	`nonn`
	AUTHOR	`John W. Layman (layman(AT)math.vt.edu), Mar 13 2002`

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Last modified December 17 23:40 EST 2009. Contains 171025 sequences.