A067210 - OEIS

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A067210

Number of n X n 0..2 matrices with all row and column sums equal.

3, 9, 87, 5673, 2577513, 8459809773, 207495141083975 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,1`
	EXAMPLE	`Some solutions for n=4` `..1..1..0..1....0..0..2..1....2..0..1..1....2..0..2..2....2..1..1..0` `..0..2..1..0....1..1..1..0....0..1..2..1....1..2..1..2....0..2..0..2` `..2..0..0..1....2..0..0..1....2..1..0..1....1..2..2..1....1..0..2..1` `..0..0..2..1....0..2..0..1....0..2..1..1....2..2..1..1....1..1..1..1`
	CROSSREFS	`Sequence in context: A032078 A203559 A184098 * A018654 A003225 A203104` `Adjacent sequences: A067207 A067208 A067209 * A067211 A067212 A067213`
	KEYWORD	`nonn`
	AUTHOR	`R. H. Hardin (rhhardin(AT)att.net), Feb 20 2002`
	EXTENSIONS	`added one term and example - R. H. Hardin, Jan 05 2012`

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Last modified February 16 20:59 EST 2012. Contains 205968 sequences.