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A153935
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Number of planar n X n X n binary triangular grids symmetric under 120 degree rotation with no more than 4 ones in any 5 X 5 X 5 subtriangle.
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0
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1, 2, 2, 3, 8, 6, 19, 86, 201, 747, 4737, 13222, 67580, 644447, 2591663, 18812351, 265019022, 1467585490, 15658902928, 326360337439
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internal format)
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OFFSET
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0,2
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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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