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A196597 Number of nX4 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 1,2,4,0,3 for x=0,1,2,3,4 2
1, 7, 37, 129, 667, 2783, 12515, 55513, 245289, 1088893, 4822927, 21375111, 94733197, 419809045, 1860501635, 8245134291, 36539888027, 161933744951, 717640229759, 3180361894219, 14094387608445, 62461999300427 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Every 0 is next to 0 1's, every 1 is next to 1 2's, every 2 is next to 2 4's, every 3 is next to 3 0's, every 4 is next to 4 3's

Column 4 of A196601

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..200

FORMULA

Empirical: a(n) = 2*a(n-1) +9*a(n-2) +10*a(n-3) -9*a(n-4) -3*a(n-5) +6*a(n-6) -5*a(n-7) +a(n-8)

EXAMPLE

Some solutions for n=5

..0..3..0..0....0..3..0..0....0..3..0..0....0..3..0..0....0..0..3..0

..3..0..0..3....0..0..0..0....3..0..0..0....0..0..0..0....3..0..0..0

..0..3..3..0....0..0..0..0....0..3..3..0....0..3..3..0....0..0..0..0

..0..0..0..3....0..0..0..3....3..0..0..0....0..0..0..0....0..0..0..3

..0..0..3..0....0..0..0..0....0..3..0..0....0..0..3..0....0..0..0..0

CROSSREFS

Sequence in context: A136204 A139891 A082113 * A143991 A243893 A012885

Adjacent sequences:  A196594 A196595 A196596 * A196598 A196599 A196600

KEYWORD

nonn

AUTHOR

R. H. Hardin Oct 04 2011

STATUS

approved

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Last modified July 26 00:58 EDT 2017. Contains 289798 sequences.