A198205 - OEIS

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A198205

Number of 2nX2 0..3 arrays with values 0..3 introduced in row major order and each element unequal to exactly two horizontal and vertical neighbors

4, 43, 658, 11029, 189376, 3272959, 56665678, 981535273, 17003856124, 294580477651, 5103458162314, 88415060881213, 1531751228239288, 26536907089886119, 459740106490112326, 7964792868501695569 (list; graph; refs; listen; history; text; internal format)

	OFFSET	`1,1`
	COMMENTS	`Column 1 of A198209`
	LINKS	`R. H. Hardin, Table of n, a(n) for n = 1..200`
	FORMULA	`Empirical: a(n) = 23a(n-1) -103a(n-2) +81*a(n-3)`
	EXAMPLE	`Some solutions for n=3` `..0..1....0..1....0..1....0..1....0..1....0..1....0..1....0..1....0..1....0..1` `..2..2....2..3....2..2....2..0....1..2....2..2....2..2....2..3....2..0....2..2` `..1..1....2..3....1..1....2..0....1..2....0..0....3..3....2..3....2..0....0..1` `..0..0....3..1....0..2....0..3....0..1....3..2....2..2....0..2....0..3....0..1` `..1..1....3..1....0..2....0..3....0..1....3..2....1..1....0..2....0..3....2..2` `..3..2....2..3....3..0....3..1....1..3....0..1....3..0....1..0....3..0....1..0`
	CROSSREFS	`Sequence in context: A186768 A130545 A027311 * A277639 A326432 A074702` `Adjacent sequences: A198202 A198203 A198204 * A198206 A198207 A198208`
	KEYWORD	`nonn`
	AUTHOR	`R. H. Hardin Oct 22 2011`
	STATUS	`approved`

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Last modified March 22 09:08 EDT 2023. Contains 361423 sequences. (Running on oeis4.)