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A154068
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Number of planar triangular n X n X n nonnegative integer grids symmetric both under 120 degree rotation and reflection with every similarly oriented 4 X 4 X 4 subtriangle summing to 8.
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0
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4, 15, 7, 13, 4, 8, 3, 4, 2, 2, 2, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2
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OFFSET
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4,1
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COMMENTS
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Value 2 starts at n=16 and continues through at least n=60.
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LINKS
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EXAMPLE
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Maximal zeros solution for n=16
.................2
................0.0
...............1.2.1
..............1.0.0.1
.............0.2.0.2.0
............2.0.1.1.0.2
...........0.0.2.0.2.0.0
..........1.2.1.0.0.1.2.1
.........1.0.0.1.2.1.0.0.1
........0.2.0.2.0.0.2.0.2.0
.......2.0.1.1.0.2.0.1.1.0.2
......0.0.2.0.2.0.0.2.0.2.0.0
.....1.2.1.0.0.1.2.1.0.0.1.2.1
....1.0.0.1.2.1.0.0.1.2.1.0.0.1
...0.2.0.2.0.0.2.0.2.0.0.2.0.2.0
..2.0.1.1.0.2.0.1.1.0.2.0.1.1.0.2
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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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