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A210137
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Number of (n+1)X3 0..3 arrays containing all values 0..3 with every 2X2 subblock having one, two or four distinct values, and new values 0..3 introduced in row major order
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1
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10, 221, 4349, 78063, 1321270, 21511540, 341220491, 5317431003, 81861887256, 1249700319322, 18966681171701, 286687896928349, 4321107835703010, 65001162786442684, 976443703757880607, 14653948717478775383
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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) = 40*a(n-1) -590*a(n-2) +3962*a(n-3) -11899*a(n-4) +12350*a(n-5) +3806*a(n-6) -12980*a(n-7) +4512*a(n-8) +1056*a(n-9) -256*a(n-10)
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EXAMPLE
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Some solutions for n=4
..0..1..0....0..0..1....0..1..2....0..1..0....0..0..1....0..1..0....0..0..0
..1..0..0....1..0..0....2..3..0....2..3..2....1..0..0....0..0..1....0..0..0
..0..0..2....0..0..0....0..1..2....0..1..0....2..3..3....0..2..3....1..0..2
..1..0..2....0..1..0....0..1..1....0..1..0....0..1..3....1..3..2....0..1..3
..2..3..1....2..3..2....1..0..0....0..0..1....2..3..3....2..0..1....2..3..1
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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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