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A154040
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Number of planar triangular n X n X n nonnegative integer grids symmetric under 120 degree rotation with every similarly oriented 4 X 4 X 4 subtriangle summing to 4.
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0
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4, 11, 13, 16, 13, 6, 10, 4, 6, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4
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OFFSET
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4,1
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COMMENTS
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Value 4 starts at n=13 and continues through at least n=55.
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LINKS
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EXAMPLE
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Maximal zeros solution for n=13
..............0
.............1.1
............0.1.0
...........0.0.0.1
..........1.0.1.0.0
.........0.0.1.1.0.0
........1.1.0.0.0.1.1
.......0.1.0.0.1.0.1.0
......0.0.0.1.1.0.0.0.1
.....1.0.1.0.0.1.0.1.0.0
....0.0.1.1.0.0.0.1.1.0.0
...1.1.0.0.0.1.1.0.0.0.1.1
..0.1.0.0.1.0.1.0.0.1.0.1.0
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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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