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A270251
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Number of nXnXn triangular 0..2 arrays with some element plus some adjacent element totalling 2 exactly once.
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1
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0, 12, 66, 468, 3612, 40020, 601368, 12473568, 355574028, 13968754800, 756926837340, 56646343727400, 5861182843734528, 839281074844449036, 166460255072308752300, 45762947464712474066844
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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........2........1........0........0........2........0........2
....2.1......2.1......2.2......0.0......1.0......2.1......1.0......2.1
...2.1.2....1.2.2....1.2.2....0.0.0....1.0.1....2.1.2....0.0.1....2.2.2
..2.2.2.1..1.2.1.2..0.2.2.1..0.1.1.0..0.0.0.0..2.2.2.2..1.0.1.2..1.1.2.2
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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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