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A233101
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Number of 4Xn 0..3 arrays with no element x(i,j) adjacent to value 3-x(i,j) horizontally, diagonally or antidiagonally, top left element zero, and 1 appearing before 2 in row major order
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1
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36, 515, 13721, 342626, 8714705, 221113913, 5614356176, 142541243171, 3619052592419, 91885574325470, 2332922952059027, 59231586841647287, 1503856400880343784, 38182060827392770301, 969420865460044960745
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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) = 25*a(n-1) +52*a(n-2) -1084*a(n-3) +16*a(n-4) +9754*a(n-5) -16165*a(n-6) +5229*a(n-7) +5498*a(n-8) -3740*a(n-9) +320*a(n-10) +96*a(n-11) for n>12
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EXAMPLE
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Some solutions for n=3
..0..1..3....0..0..0....0..1..1....0..0..1....0..1..1....0..1..0....0..0..1
..0..1..3....1..0..1....3..1..3....2..0..1....1..1..1....3..1..3....2..0..2
..0..1..0....1..1..1....0..2..3....2..3..2....0..0..0....0..1..3....2..2..2
..3..1..3....0..1..0....0..2..0....2..0..2....0..2..2....0..2..3....3..3..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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