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A193874
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Number of nXnXn triangular 0..3 arrays with no element equal to the difference mod 4 of any two of its neighbors
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1
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4, 36, 103, 1179, 33943, 2110051, 268635167, 68723825153, 35184506013367, 36028802839103173, 73786976651882166835, 302231454934581155492511, 2475880078574541543008355341, 40564819207303993488253830603201
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OFFSET
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1,1
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LINKS
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EXAMPLE
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Some solutions for 4X4X4
.....4........3........1........3........2........3........3........4
....1.1......2.2......1.1......3.3......3.2......3.3......2.3......1.1
...4.1.4....2.3.2....1.1.1....2.3.3....2.3.3....2.2.3....3.3.3....1.1.4
..4.1.4.1..2.3.3.3..1.1.3.1..3.2.2.2..2.2.2.2..3.3.2.2..2.2.2.3..1.1.1.4
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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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