A198405 - OEIS

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A198405

Number of 2nX2 0..4 arrays with values 0..4 introduced in row major order and each element equal to exactly one horizontal and vertical neighbor

2, 17, 377, 11473, 375273, 12456897, 414711897, 13814539697, 460231956937, 15333001667233, 510833776539193, 17018936996199057, 567002973887727017, 18890274083549781377, 629348476275500726297, 20967377362990867086193 (list; graph; refs; listen; history; text; internal format)

	OFFSET	`1,1`
	COMMENTS	`Column 1 of A198408`
	LINKS	`R. H. Hardin, Table of n, a(n) for n = 1..200`
	FORMULA	`Empirical: a(n) = 51a(n-1) -691a(n-2) +3601a(n-3) -7056a(n-4) +4096*a(n-5)`
	EXAMPLE	`Some solutions for n=3` `..0..0....0..0....0..1....0..0....0..0....0..0....0..0....0..1....0..0....0..1` `..1..2....1..2....0..1....1..1....1..1....1..2....1..1....0..1....1..1....0..1` `..1..2....1..2....2..3....2..3....2..3....1..2....2..2....2..2....0..0....2..3` `..3..3....0..0....2..3....2..3....2..3....2..0....3..3....0..0....2..2....2..3` `..4..0....3..2....1..0....3..0....4..4....2..0....4..4....1..3....0..0....4..4` `..4..0....3..2....1..0....3..0....2..2....1..1....2..2....1..3....1..1....3..3`
	CROSSREFS	`Sequence in context: A201785 A204249 A128159 * A202972 A085617 A152557` `Adjacent sequences: A198402 A198403 A198404 * A198406 A198407 A198408`
	KEYWORD	`nonn`
	AUTHOR	`R. H. Hardin Oct 24 2011`
	STATUS	`approved`

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Last modified June 19 10:52 EDT 2013. Contains 226404 sequences.