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A210329
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1/4 the number of (n+1)X3 0..3 arrays with every 2X2 subblock having two or three distinct clockwise edge differences
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1
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406, 11877, 344659, 10050240, 293095459, 8549740834, 249408131339, 7275728429567, 212248230477148, 6191735605717011, 180626272896775892, 5269258543534397671, 153715660936507360882, 4484218150761298939517
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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) = 47*a(n-1) -547*a(n-2) -255*a(n-3) +35216*a(n-4) -129394*a(n-5) -465060*a(n-6) +2920628*a(n-7) +320982*a(n-8) -20531472*a(n-9) +17232541*a(n-10) +55329403*a(n-11) -75077657*a(n-12) -49764339*a(n-13) +111287472*a(n-14) -12747232*a(n-15) -52250238*a(n-16) +26800488*a(n-17) -2501204*a(n-18) -451078*a(n-19) -5036*a(n-20)
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EXAMPLE
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Some solutions for n=4
..3..0..1....1..2..1....1..3..3....2..1..1....2..1..3....1..3..1....1..0..0
..2..1..2....1..3..2....3..1..1....0..0..0....2..1..1....1..1..1....0..0..1
..3..1..1....1..3..1....1..3..2....1..0..1....2..0..1....2..3..2....1..2..1
..1..3..3....1..3..2....3..1..1....1..0..1....2..1..0....1..1..1....1..0..0
..3..1..3....1..1..2....1..1..2....0..0..1....0..0..1....3..3..1....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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