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A265664
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Number of 3Xn arrays containing n copies of 0..3-1 with no element plus any horizontal or vertical neighbor equal to 3-1.
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1
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2, 0, 4, 16, 60, 228, 1024, 4288, 18172, 76838, 326264, 1390048, 5947760, 25515274, 109801760, 473895774, 2050771696, 8896415264, 38680996104, 168532976250, 735715851956, 3217440736916, 14093823129980, 61831989407076
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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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EXAMPLE
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Some solutions for n=4
..0..0..0..1....0..1..0..0....2..2..2..1....2..2..1..0....1..0..1..2
..1..0..1..2....1..2..1..0....1..2..1..0....2..1..0..0....0..1..2..2
..2..1..2..2....2..2..2..1....0..1..0..0....1..2..1..0....0..0..1..2
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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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