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A208097
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Number of 2 X n nonnegative integer arrays with new values 0 upwards introduced in row major order and no element equal to any horizontal, diagonal or antidiagonal neighbor (colorings ignoring permutations of colors).
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2
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2, 4, 30, 377, 7239, 193228, 6752442, 296290708, 15835464207, 1007305486325, 74890158775564, 6413015600048526, 624933541074620780, 68603269124243415049, 8411144435499643711885, 1143251056778815843116186
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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..1..2..1....0..1..0..1....0..1..2..0....0..1..2..0....0..1..2..0
..3..1..4..5....0..1..0..2....0..1..3..1....0..1..2..0....3..1..2..4
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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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