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A271138
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Number of nXnXn triangular 0..3 arrays with new values introduced in sequential zero-upwards order and exactly one 2x2x2 triangle having values all different.
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0
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0, 1, 56, 4560, 625280, 158875520, 78509767680, 77552409009664, 155738737883810688, 642865213102166747136, 5496169383763345236125056
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OFFSET
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1,3
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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
....0.0......0.1......1.2......1.0......1.2......0.0......1.2......1.2
...0.1.0....2.1.0....1.2.2....0.1.1....2.2.1....1.1.2....1.2.3....0.1.2
..2.2.1.0..1.2.1.1..2.2.3.2..2.1.1.0..2.2.1.3..2.2.2.1..2.2.2.2..2.0.1.1
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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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