A205304 - OEIS

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A205304

Number of nXn 0..3 arrays with no occurence of three equal elements in a row horizontally or vertically, and new values 0..3 introduced in row major order

1, 15, 7445, 70985206, 8615950028840, 13585407518869992739 (list; graph; refs; listen; history; text; internal format)

	OFFSET	`1,2`
	COMMENTS	`Diagonal of A205310`
	LINKS	`Table of n, a(n) for n=1..6.`
	EXAMPLE	`Some solutions for n=5` `..0..1..0..0..1....0..0..1..0..0....0..0..1..0..0....0..0..1..1..0` `..0..0..1..2..1....2..1..3..2..2....2..0..3..0..2....0..1..0..0..2` `..3..1..3..0..0....2..2..3..2..2....0..3..1..1..2....1..1..0..0..3` `..1..0..2..0..1....3..1..1..3..1....0..2..0..1..0....1..3..1..1..0` `..0..2..0..1..1....1..2..1..3..2....3..2..2..3..2....2..3..2..3..1`
	CROSSREFS	`Sequence in context: A113795 A205155 A208095 * A206295 A074488 A059950` `Adjacent sequences: A205301 A205302 A205303 * A205305 A205306 A205307`
	KEYWORD	`nonn`
	AUTHOR	`R. H. Hardin Jan 25 2012`
	STATUS	`approved`

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Last modified May 22 20:16 EDT 2013. Contains 225568 sequences.