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A183504
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Number of nX2 0..3 arrays with no element equal to the sum mod 4 of its horizontal and vertical neighbors
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1
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12, 81, 776, 6561, 59292, 531441, 4786704, 43046721, 387440172, 3486784401, 31381355016, 282429536481, 2541867422652, 22876792454961, 205891156016784, 1853020188851841, 16677181828806732, 150094635296999121
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OFFSET
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1,1
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COMMENTS
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LINKS
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FORMULA
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Empirical: a(n)=9*a(n-1)+81*a(n-4)-729*a(n-5)+81*a(n-8)-729*a(n-9)-6561*a(n-12)+59049*a(n-13)
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EXAMPLE
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Some solutions for 3X2
..3..2....1..0....2..3....1..1....2..3....1..0....0..3....2..2....1..2....2..0
..2..1....3..0....2..2....3..3....1..2....2..0....3..1....1..3....2..3....0..0
..3..2....1..0....3..0....2..0....3..0....2..1....1..1....1..3....3..0....0..3
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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