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A210177
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Number of (n+1)X3 0..3 arrays containing all values 0..3 with every 2X2 subblock having three or four distinct values, and new values 0..3 introduced in row major order
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1
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51, 2316, 79017, 2563795, 82255351, 2632469015, 84200356757, 2692825679001, 86117153792391, 2754026796151627, 88073648144059741, 2816590158892560329, 90074382683817260687, 2880573249877838455779, 92120555990382118611861
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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) = 39*a(n-1) -211*a(n-2) -523*a(n-3) +2954*a(n-4) -1030*a(n-5) -4272*a(n-6) +2096*a(n-7) -192*a(n-8)
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EXAMPLE
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Some solutions for n=4
..0..0..0....0..1..1....0..0..1....0..0..0....0..0..0....0..0..0....0..0..0
..1..2..1....1..2..3....1..2..3....1..2..1....1..2..1....1..2..1....1..2..1
..2..0..1....3..0..1....3..3..0....1..0..0....2..3..0....1..3..3....0..1..3
..0..1..2....1..1..2....0..1..2....1..2..3....1..3..1....3..2..0....2..2..1
..0..3..0....2..3..2....1..2..3....3..0..3....3..0..1....1..3..3....0..1..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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