A045951 - OEIS

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A045951

Number of solutions to product_A+product_B=product_C where A,B,C is a partition of {1,2,...n}.

0, 1, 1, 0, 1, 1, 1, 1, 3, 4, 0, 0, 0, 0, 2, 0, 0, 0, 15, 42 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,9`
	EXAMPLE	`a(9)=3 since (1 2 6 7)+(4 9)=(3 5 8) and (1 3 4 8 )+(5 6)=(2 7 9) and (1 2 6)+(3 7 8)=(4 5 9).`
	CROSSREFS	`Sequence in context: A081174 A171604 A132139 * A025120 A025096 A086798` `Adjacent sequences: A045948 A045949 A045950 * A045952 A045953 A045954`
	KEYWORD	`hard,nonn`
	AUTHOR	`Erich Friedman (erich.friedman(AT)stetson.edu)`
	EXTENSIONS	`More terms from David W. Wilson (davidwwilson(AT)comcast.net).`

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Last modified February 14 23:53 EST 2012. Contains 205689 sequences.