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A208349
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Number of n X 4 0..3 arrays with new values 0..3 introduced in row major order and no element equal to any knight-move neighbor (colorings ignoring permutations of colors).
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1
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15, 868, 12625, 230387, 4773885, 103672036, 2280287753, 50481169071, 1122098238432, 24983185355723, 556622494082921, 12405478452873059, 276529980588607690, 6164555722628477878, 137428302821781111484
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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..0....0..0..0..0....0..1..1..0....0..0..0..1....0..0..1..0
..1..1..1..1....1..1..1..2....0..1..2..0....1..0..1..1....2..1..1..2
..2..2..3..2....2..1..2..3....0..2..2..2....2..2..2..3....2..3..1..0
..2..0..3..3....3..0..3..2....3..1..2..0....3..0..3..3....2..3..3..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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