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A270504
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Number of nXnXn triangular 0..2 arrays with some element plus some adjacent element totalling 2+1 exactly once.
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1
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0, 6, 144, 5406, 369072, 47829828, 12072484260, 6018099563412, 5978376752357856, 11906720428681033194, 47747190052669169665500, 386741181278527199554452264, 6342331030790597545544573997684
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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
.....2........1........0........2........0........1........1........1
....0.1......0.0......0.1......0.0......0.1......1.0......2.0......1.1
...0.1.1....0.0.2....0.0.0....1.1.1....2.2.0....1.1.0....0.0.0....1.1.0
..0.1.1.0..1.1.1.0..1.2.2.0..1.0.0.2..0.2.0.2..2.0.0.1..0.1.1.1..0.0.2.0
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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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