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A223303
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4X4X4 triangular graph coloring a rectangular array: number of nX6 0..9 arrays where 0..9 label nodes of a graph with edges 0,1 0,2 1,2 1,3 1,4 2,4 3,4 2,5 4,5 3,6 3,7 4,7 6,7 4,8 5,8 7,8 5,9 8,9 and every array movement to a horizontal or vertical neighbor moves along an edge of this graph
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1
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9216, 2918052, 1148040516, 470062209228, 195984333263964, 82235766550254744, 34624128327772135980, 14597586270725996512680, 6158981902609383720107172, 2599381915639470430301409024, 1097252078673262192056218956776
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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=3
..0..1..0..1..4..8....0..1..0..2..4..7....0..1..4..1..3..1....0..1..4..1..3..1
..1..0..1..0..1..4....1..0..1..4..1..3....1..0..1..2..1..0....1..0..1..2..1..3
..0..1..2..1..4..2....0..1..3..7..3..1....0..1..2..1..3..1....0..1..0..1..4..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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