A199090 - OEIS

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A199090

Number of 2nX4 0..3 arrays with values 0..3 introduced in row major order, the number of instances of each value within one of each other, and every element equal to exactly one horizontal or vertical neighbor

5, 420, 44837, 5471810, 726413391, 101787127746, 14800090575471, 2211229549716802, 337343474770282699, 52327061345761775192 (list; graph; refs; listen; history; text; internal format)

	OFFSET	`1,1`
	COMMENTS	`Even terms of column 4 of A199092`
	LINKS	`Table of n, a(n) for n=1..10.`
	EXAMPLE	`Some solutions for 4X4` `..0..1..2..3....0..1..2..2....0..1..2..0....0..0..1..0....0..1..2..2` `..0..1..2..3....0..1..0..0....0..1..2..0....2..3..1..0....0..1..0..0` `..3..3..0..1....2..2..3..3....3..3..1..1....2..3..2..2....3..2..1..3` `..2..2..0..1....3..3..1..1....2..2..3..3....1..1..3..3....3..2..1..3`
	CROSSREFS	`Sequence in context: A218406 A217939 A147684 * A218393 A038003 A054332` `Adjacent sequences: A199087 A199088 A199089 * A199091 A199092 A199093`
	KEYWORD	`nonn`
	AUTHOR	`R. H. Hardin Nov 02 2011`
	STATUS	`approved`

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Last modified January 16 06:48 EST 2021. Contains 340204 sequences. (Running on oeis4.)