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A210399
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Number of (n+1)X4 0..3 arrays with every 2X2 subblock having one or three distinct values, and new values 0..3 introduced in row major order
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1
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549, 29647, 1596154, 85979301, 4631193134, 249456180709, 13436785945910, 723763304576749, 38985016148233742, 2099901274580672917, 113109748262417625254, 6092579354615210957373, 328172626696350857253566
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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) = 65*a(n-1) -483*a(n-2) -7397*a(n-3) +54220*a(n-4) +315572*a(n-5) -1567384*a(n-6) -4952640*a(n-7) +15991008*a(n-8) +21762048*a(n-9) -51440128*a(n-10) -13774848*a(n-11) +33619968*a(n-12)
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EXAMPLE
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Some solutions for n=4
..0..0..1..2....0..0..0..0....0..0..0..0....0..0..0..0....0..1..1..0
..0..0..3..1....0..0..0..0....0..0..0..0....0..0..0..0....0..2..3..0
..1..2..2..2....1..2..1..3....0..0..0..0....1..2..1..2....0..3..1..1
..1..3..0..1....1..3..3..2....0..0..0..0....0..1..0..0....3..1..0..2
..1..0..1..2....1..0..1..1....1..2..3..1....2..2..1..2....1..0..2..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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