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A154072
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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 9.
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0
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20, 60, 123, 304, 180, 208, 509, 248, 136, 220, 132, 58, 42, 78
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OFFSET
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4,1
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LINKS
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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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