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A216691
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Number of horizontal, vertical, diagonal or knight-move neighbor colorings of an nX2 array with new integer colors introduced in row major order
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0
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1, 2, 9, 90, 1451, 33694, 1047754, 41569451, 2033056870, 119455094071, 8265294573126, 662782941109746, 60794941081100523, 6309797655336714672
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OFFSET
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1,2
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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....0..1....0..1....0..1....0..1....0..1....0..1....0..1....0..1....0..1
..1..2....2..3....2..3....1..2....2..3....1..2....2..3....2..3....2..3....2..3
..3..4....4..5....3..4....0..3....0..1....3..4....3..4....4..5....3..4....3..4
..1..5....6..7....4..5....3..2....4..3....1..0....0..1....6..1....5..6....5..1
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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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