A193120 - OEIS

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A193120

Number of nXn symmetric 0..3 arrays with each element equal to the sum mod 4 of two of its horizontal and vertical neighbors

0, 1, 17, 525, 60155, 26946822, 36060642759, 159137536303316, 2292846876178991797 (list; graph; refs; listen; history; text; internal format)

	OFFSET	`1,3`
	LINKS	`Table of n, a(n) for n=1..9.`
	EXAMPLE	`Some solutions for 4X4` `..0..0..2..0....0..2..2..0....2..1..1..0....0..2..1..0....0..2..2..3` `..0..0..2..2....2..1..3..2....1..3..2..3....2..2..1..3....2..1..3..1` `..2..2..3..1....2..3..0..2....1..2..0..1....1..1..2..2....2..3..2..2` `..0..2..1..2....0..2..2..0....0..3..1..2....0..3..2..0....3..1..2..0`
	CROSSREFS	`Sequence in context: A012232 A114063 A214135 * A112716 A218351 A197395` `Adjacent sequences: A193117 A193118 A193119 * A193121 A193122 A193123`
	KEYWORD	`nonn`
	AUTHOR	`R. H. Hardin Jul 16 2011`
	STATUS	`approved`

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Last modified May 23 12:52 EDT 2013. Contains 225587 sequences.