A067215 - OEIS

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A067215

Number of n X n 0..7 matrices with all row and column sums equal.

1, 8, 64, 10088, 82112704, 32701809796548, 664942846307414508064, 717494365786942428294915062416 (list; graph; refs; listen; history; text; internal format)

	OFFSET	`0,2`
	LINKS	`Table of n, a(n) for n=0..7.`
	EXAMPLE	`Some solutions for n=3` `..5..6..2....6..7..4....6..0..4....5..2..1....3..2..5....2..1..5....4..7..5` `..3..4..6....6..4..7....0..4..6....3..4..1....4..1..5....5..2..1....7..2..7` `..5..3..5....5..6..6....4..6..0....0..2..6....3..7..0....1..5..2....5..7..4`
	CROSSREFS	`Column 7 of A202784.` `Sequence in context: A132545 A034376 A202783 * A307436 A067685 A304306` `Adjacent sequences: A067212 A067213 A067214 * A067216 A067217 A067218`
	KEYWORD	`nonn`
	AUTHOR	`R. H. Hardin, Feb 20 2002`
	EXTENSIONS	`a(0)=1 prepended and a(6)-a(7) from Andrew Howroyd, May 11 2020`
	STATUS	`approved`

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Last modified April 1 03:04 EDT 2023. Contains 361673 sequences. (Running on oeis4.)